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Two water pipes P and Q having diameters...

Two water pipes `P` and `Q` having diameters `2 xx 10^(-2) m ` and `4 xx 10^(-2) m`, respectively, are joined in series with the main supply line of water. The velocity of water flowing in pipe `P` is

A

4 times that of Q

B

2 times that of Q

C

`1//2` times of that of Q

D

`1//4` times that of Q

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