1.

Taps P, Q and R can fill a tank in 3, 4 and 5 hours respectively. If all the taps are opened together andafter 30 minutes taps Q and R are turned off, find the total time in which the tank is full.

A. (279/120)
B. (259/120)
C. (299/120)
D. (309/120)
Answer» B. (259/120)


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