Question

A can do a piece of work in 10 days and b can do it in 15 days. How long will it take for them to finish it together?

Answer 1

Given A can do the work in 10 days
Hence, A can do 1/10th of the work in 1 day

Given B can dothe work in 15 days
Hence B can do 1/15th of the work in 1 day

Hence A and B together will do (1/10+1/15)th of the work in 1 day
=3+2/30
=5/30
=1/6
Hence A and B together will complete the wor k in (1÷1/6)
=6 days
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