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A rectangular water reservoir id 10.8m by 3.75m at the base . Water flows into it at the rate of 18m/s through a pipe having cross-section 7.5cm × 4.5 cm.

Find the height in which water will rise in 30 minutes


Water comes out from pipe in 1 sec = 7.5*4.5*1800 = 60750 cm^3 = 6.075 m^3
water comes out from pipe in 30 min = 6.075*30*60 = 10935 m^3
10.8*3.75*rise in level = 10935
rise in level = 10935/ (10.8*3.75) = 10935/40.5 = 270 m
2 5 2
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