Question

Pipe 'M' and 'N' can fill a tank in 2 hours and 1 hour 20 minutes respectively. 'M' is opened alone. After 30 minutes, 'M' is closed and 'N' is opened. Find the time taken by 'N' to fill the remaining tank.

A 40 minutes
B 45 minutes
C 50 minutes
D 60 minutes
E 55 minutes
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