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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