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Two pipes A and B can fill a cistern in 75/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:

A. 5 min. B. 9 min.
C. 10 min. D. 15 min.

Read Solution (Total 1)

If B is closed after x mins, then
30*2/75 + x/45 = 1
x/45 = 1 - 4/5 = 1/5
x= 45/5 = 9 mins .... option B
13 years agoHelpfull: Yes(2) No(1)

GENPACT Other Question

Father’s age is three years more than three times the son’s age.
After three years, father’s age will be ten years more than twice the son’s age.
What is the father’s present age. A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:

A. 6 hours
B. 10 hours
C. 15 hours
D. 30 hours