A and B can do a piece of work in 15 days and 20 days respectively. How long will it take to complete the same work,if they both work on it together?
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Man A does (1/20)th of the work in 1 day.
Man B does (1/15)th of the work in 1 day.
Man A and B do (1/20)+(1/15) = (15+20)/(20*15) = (35/300) = 7/60th of the work in 1 day.
So A and B will do the same work in 60/7 or 8 and 4/7 days.
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