Question

Pipes X and Y can independently fill a tank in 80 minutes and 90 minutes respectively, while pipes X and Z together take 3 hours to fill the same tank. If pipes X and Y are turned on for the first 36 minutes, after which pipe X is turned off and pipe Z is turned on, how long will it take in total to fill the tank?

A 55 min
B 72 min
C 25 min
D 10 min
E none of these
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