There are four outlet pipes of the same capacity fixed one above the other to a water tank. The first pipe is at the
bottom level and the fourth pipe is at three-fourths of the height of the tank. The third pipe is equidistant from the
second pipe and the fourth pipe, the second pipe is equidistant from the first and the third. The capacity of each
pipe is such that it can empty a full tank in four hours, whereas one inlet pipe can fill the empty tank in one hour.
The pipe is opened to fill the empty tank and after one hour it is closed, then all the outlet pipes are opened
When the tank is full, all the four pipes are opened together and shut after one hour. If the inlet pipe is opened now, the time in which the tank will be full is:
(A) 60 minutes (B) 42.5 minutes
(C) 17.5 minutes (D) 10 minutes
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