Question

Please help me................
In the above question.
That would be a lot of help for me

Answer 1

in 10 minutes ....






.............

Answer 2

A+B=25min
A=50min
ATQ

A+B work for 20min
So, time left to complete work =25-20=5min
Work left=1/5
Work done in 20min=1-1/5=4/5
B can complete whole work alone in 1/25-1/50
=1/50=50mins
B can complete 1 work in =50
So 1/5 work in =50*1/5=10mins
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