Question

Pipe 'P' and 'Q' can fill a tank in 50 minutes and 1 hour 40 minutes respectively. 'P' is opened alone. After 20 minutes, 'P' is closed and 'Q' is opened. Find the time taken by 'Q' to fill the remaining tank.

A 60 minutes
B 70 minutes
C 80 minutes
D 90 minutes
E 100 minutes
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