Question

Pipe 'X' and 'Y' can fill a tank in 1 hour and 1 hour 30 minutes respectively. 'X' is opened alone. After 18 minutes, 'X' is closed and 'Y' is opened. Find the time taken by 'Y' to fill the remaining tank.

A 48 minutes
B 54 minutes
C 63 minutes
D 66 minutes
E 72 minutes
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