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Question
A city tanker is filled by two large pipes, X and Y, together in 24 and 16 minutes respectively. On a certain day, pipe Y is used for first half of the time, and both X and Y are used for the second half. How many minutes does it take to fill the tank?
A
12 mins.
B
13 mins.
C
11 mins.
D
14 mins.
Soln.
Ans: a
Ans: a
Let the time taken be x. Y is running for x mins, and X for x/2. So $(x/16 + x/{2 × 24})$ = 1. Solving for x, we get x = 12 mins.