A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

A and B together can plough a field in 10 hours but by himself A re

1.	A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?
A.	5 hrs
B.	17 hrs
C.	23 hrs
D.	30 hrs
Answer» E.

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A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

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