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Q.

A 10 HP motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litre at a height of 10m from the ground. The running time of the motor to fill the empty water tank is (g=10ms−2)

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a

5 minutes

b

10 minutes

c

15 minutes

d

20 minutes

answer is C.

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Detailed Solution

Volume of water to raise = 22380 l = 22380×10–3m3P=mght=Vρght⇒t=VρghPt=22380×10−3×103×10×3010×746=15min
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