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

Answer»

 41/21 hours



Pipe A fills 2/15 part in 2 hours.
Reamaining part = B/15
Pipe A and B FILL 7x2/60 = 7/30 part in 2 hours.
REMAINING part = 13/15 - 7/30 = 26-7/30 = 19/30
Pipes A, B and C fill 3x2/20 = 3/10 part in 2 hours 
Remaining part = 19/30 - 3/10 = 10/30 = 1/3
1/3 will be FILLED in = 1/3 X 40/7 = 40/21 hours.



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