Three pipes A , B and C takes 15, 24 and 36 minutes respectively to fill a tank. Pipe D can empty it in 1 hour. If all the four pipes are kept open then find the time taken to fill the tank.

Three pipes A , B and C takes 15, 24 and 36 minutes respectively to fi

1.	Three pipes A , B and C takes 15, 24 and 36 minutes respectively to fill a tank. Pipe D can empty it in 1 hour. If all the four pipes are kept open then find the time taken to fill the tank.
A.	$$8{16 over 43}hr$$
B.	$$7{2 over 3}hr$$
C.	$$8{1 over 8}hr$$
D.	$$5{12 over 25}hr$$
Answer» B. $$7{2 over 3}hr$$

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Three pipes A , B and C takes 15, 24 and 36 minutes respectively to fill a tank. Pipe D can empty it in 1 hour. If all the four pipes are kept open then find the time taken to fill the tank.

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