Question

Two persons A and B can do a piece of work in 12 hours . The person B alone can do it in 15 hours . In how many hours the person A alone can do it

Answer 1

Answer:

60 hours

Step-by-step explanation:

B can do 1/15 part of work in one hour

B completes 12/15 part of work in 12 hours and the rest is completed by A

So 1-12/15=3/15 of work is completed by A in 12 hours.

A can complete 1/12*3/15=1/60 part of work in one hour

To complete work alone A needs 1:1/60=60 hours

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Answer 2

ANSWER

Answer is 60 hours