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একটি মাকড়সা ভিন্ন গতিতে হাঁটে এবং দৌড়ায়। মাকড়সাটি ১০ সেকেন্ডে হেঁটে এবং ৯ সেকেন্ডে দৌড়িয়ে ৮৫ কি. দূরত্ব অতিক্রম করে। আবার ৩০ সেকেন্ডে হেঁটে এবং ২ সেকেন্ডে দৌড়িয়ে ১৩০ মি. দূরত্ব অতিক্রম করে। মাকড়সাটির হাঁটার ও দৌড়ের গতিবেগ কত?
হাঁটা ২ মি/ সে, দৌড় ২৫ মি./ সে.
হাঁটা ৩ মি. /সে. দৌড় ৬ মি. /সে.
হাঁটা ৩ মি. / সে, দৌড় ২০ মি. / সে.
হাঁটা ৪ মি. /সে. দৌড় ৫ মি./সে.
ANSWER : 4
Descrption
<p><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">মনেকরি,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">একটি মাকড়সার হাঁটার গতিবেগ প্রতি সেকেন্ডে x মি.</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">এবং দৌড়ের গতিবেগ প্রতি সেকেন্ডে y মি.</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">১ম শর্তানুসারে,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">10x + 9y = 85 - - - - - - - - - - - - - - - - - - - - - (১)</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">২য় শর্তানুসারে,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">30x + 2y = 130 - - - - - - - - - - - - - - - - - - - (২)</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">১নং সমীকরণকে 3 দ্বারা এবং ২নং সমীকরণকে 1 দ্বারা গুণ করে পাই,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">30x + 27y = 255 - - - - - - - - - - - - - - (3)</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">30x + 2y = 130 - - - - - - - - - - - - - - - - (4)</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">৩নং সমীকরণ থেকে ৪নং সমীকরণ বিয়োগ করে পাই,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">30x + 27y - 30x - 2y = 255 - 130</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = > 25y = 125</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = > y = 125/25</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = > y = 5</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">১নং সমীকরণে y = 5 বসিয়ে পাই,</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">10x + 9*5 = 85</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = >10x = 85 - 45</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = > x = 40/10</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;"> = > x = 4</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">অতএব, মাকড়সাটির হাঁটার গতিবেগ = 4মি./সে.</span><br style = "box - sizing: border - box; font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px;" /><span style = "font - family: 'source sans pro', 'helvetica neue', Helvetica, Arial, sans - serif; font - size: 15.73px; background - color: #ffffff;">এবং দৌড়ের গতিবেগ = 5 মি./সে.</span></p>
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