Question

Question #e0522

Answer 1

c) 15

Explanation:

Let B complete the job in days`=x`
`:.` B can do alone in `1` day`=1/x` job

A can do alone in `1` day`=1/10` job
Combining both
Both A and B can do in `1` day`=1/10+1/x` job
Given is that both A and B can do in `1` day`=1/6` job
Equating both we obtain
`1/10+1/x=1/6`
Solving for `x`
`1/x=1/6-1/10`
`=(5-3)/30`
`=1/15`
or `x=15`