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Question
A can do 3 piece of work in 4 hours, B and C together in 3 hours , and A and C together in 2 hours. How long will B alone take to do it?
8 hours
12 hours
s10hours
24 hours
ANSWER : 2
Descrption
<p>A,B and C together need = (3×4)/(3 + 4) = 12/7 hours</p> <p>And C need 2 hours</p> <p>∴B need = {(12/7)×2}/{2 - (12/7)} hours</p> <p> = (24/7)/{(14 - 12)/7}</p> <p> = 24/2 hours</p> <p> = 12 hours </p>
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