Four pipes each of 5 cm in diameter are to be replaced by a single pipe discharging the same quantity of water. If the speed of water remains same in both the cases, then the diameter (in cm) of the single pipe is
A
5
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B
6
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C
10
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D
12
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Solution
The correct option is C10
Radius of four pipes =2.5cm Radius of single pipe =R If all the pipes are of length l Volume of the pipe =πr2l Thus, Volume of water from four pipes =Volume of water from a single pipe