Discussion of Question with ID = 078 under Time-and-Work

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Question

A new tub can be filled by a tap in 9 minutes. But the tub is worn out, and there is a leakage that can empty the tub in 18 minutes. In how many minutes will the tap be able to fill the tub?

A

18 mins.

B

19 mins.

C

20 mins.

D

21 mins.

Soln.
Ans: a

Putting x = 9 and y = 18 in the shortcut method, we get ${xy}/{y - x}$ = 18.


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