Question

Pipe ‘X’ alone can fill a tank in 20 hours. When pipe ‘X’ and ‘Y’ are opened together, they can fill 60% of the same tank in 6 hours. Find the time taken by pipe ‘Y’ alone to fill 80% of the same tank.

A 25 hrs
B 48 hrs
C 22 hrs
D 16 hrs
E None of these
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