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Question

A rectangular water tank is 80 m × 40 m. Water flows into it through a pipe 40 sq.cm at the opening at a speed of 10 km/hr. By how much, the water level will rise in the tank in half an hour?


A

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B

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C

1 cm

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D

5 cm

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Solution

The correct option is B


Length of water column flown in 1 min. (10×100060)m = 5003m

Volume flow for 30 min =(30×5003×40100×100)m3= 20 m3

Rise in water level =(2040×80)m=(1160×100)cm=58cm


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