Four pipes fill a tank in 15, 20, 30 and 40 hours respectively. The first pipe was opened at 6 am, the second at 8 am, the third at 10 am and the fourth at 12 noon. When will the tank get filled compl

Four pipes fill a tank in 15, 20, 30 and 40 hours respectively. The

1.	Four pipes fill a tank in 15, 20, 30 and 40 hours respectively. The first pipe was opened at 6 am, the second at 8 am, the third at 10 am and the fourth at 12 noon. When will the tank get filled compl
A.	38/21 hours
B.	39/21 hours
C.	40/21 hours
D.	41/21 hours
Answer» E.

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Four pipes fill a tank in 15, 20, 30 and 40 hours respectively. The first pipe was opened at 6 am, the second at 8 am, the third at 10 am and the fourth at 12 noon. When will the tank get filled compl

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