Asif can do a job in 15 hours, and Russel can do the same job in 9 hours. If they start doing the job together at 6 a.m. and Russel stops working at 9 a.m. at what time will Asif finish the job?
Created: 6 years ago |
Updated: 11 months ago
best des
6 am to 9 am is 3 hour
Asif, Needs 15 hrs to do 1 whole work
3 needs 3/9 = 1/3
work left = 1 - ( 1/5 + 1/3) = 1 - 8/15 = 7/15
Asif can do 1 work in 15 hours
asif can do 7/15 work ( 15×7) /15 = 7 hour
7 hour after 9 am is 2 pm
Md Azizur Rahman
Founder of Satt
Total job=90
Asif Efficiency 90/15=6
Russel Efficiency 90/9=10
In 3 hr job done by Asif 6*3=18
Russel 10*3=30
Total job left (90-48)= 42
So, Asif can do the job in 42/6= 7 hours.
9 am + 7 hr = 4 pm.
ঐকিক নিয়ম (Unitary Methods):
একটি জিনিসের দাম, ওজন, পরিমাণ ইত্যাদি বের করে নির্দিষ্ট সংখ্যক এই জাতীয় জিনিসের দাম, ওজন, পরিমাণ ইত্যাদি বের করার নিয়মকে ঐকিক নিয়ম বলে।
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