Question

Pipe 'A' and 'B' can fill a tank in 1 hour 30 minutes and 2 hours respectively. 'A' is opened alone. After 24 minutes, 'A' is closed and 'B' is opened. Find the time taken by 'B' to fill the remaining tank.

A 48 minutes
B 56 minutes
C 60 minutes
D 64 minutes
E 88 minutes
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