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Question
Nazir can wash his car 15 minutes while his son takes twice as long. If they work together how many minutes will the job take them?
5
15
10
20
ANSWER : 3
Descrption
<p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">His son can wash the car in (15 × 2 = 30) minutes</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">Nazir can wash 1/15 part of the car in 1 minute</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">His son can wash 1/30 part of the can in 1 minute</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">Together they can wash (1/15 + 1/30 = 1/10) part of the car in 1 minute</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">So, together they can wash the whole car in <strong>10</strong> minutes.</span></p> <p> </p>
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