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Question
A can do a piece of work in 15 days and B can do it in 10 days. Working together how long will they take to finish the work?
4 days
5 days
6 days
7 days
8 days
ANSWER : 3
Descrption
<p>In 15 days A can do 1 portion</p> <p>in 1 days A can do 1/15 portion</p> <p>In 10 days B can do 1 portion</p> <p>In 1 days B can do 1/10 portion</p> <p>In 1 day A & B can do ( 1/15 + 1/10) or 2 + 3/30</p> <p>or 5/30 or 1/6 portion</p> <p>A & B can finish 1/6 portion in 1 day</p> <p>A & B can finish 1 portion in 1/6 day</p> <p> = 6 days </p>
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