A and B together can complete a railway sleeper alignment in 10 days. B alone can do it in 15 days.
In how many days can A alone complete the work?
Show answer & explanation
Correct answer: C
Explanation
A + B = 10 days
B = 15 days
(A + B) = 1/10
B = 1/15
⇒ A = 1/10 − 1/15
= (3 − 2)/30
= 1/30
Time = 30 days