1.

Three pipes A, B and C can fill a cistern in 15, 24 and 36 minutes respectively. If pipe D can drain a full tank in 1 hour, how long will it take for the tank to be filled if all the four pipes are kept open together?

A. \(9\frac{1}{8}\) minutes
B. \(5\frac{12}{25}\) minutes
C. \(7\frac{2}{3}\) minutes
D. \(8\frac{16}{43}\) minutes
Answer» E.


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