Question 86

A pipe is 3 times faster than another pipe Q and takes 32 minutes less than pipe to fill a cistern. In what time will the cistern be full if both pipes are opened together?

Solution

Let pipe A takes p min to fill

Then,

pipe Q takes 3p min to fill

=> 3p - p = 32

=> p = 16 min => 3p = 48 min

Required, both pipes to fill = (48 x 16)/(48 + 16) min = 12 min.

C is correct choice.

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