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A rectangular water reservoir 7.2 m by 2.5 m at the base. Water flow into it through whose cross section is 5 cm× 9cm at the rate of 20 m per second. find

the height to which the water will rise in the reservoir in 40 minutes.


area of cross section(cm)×rate of water flow(cm/min)
=area of rectangle(cm)×h
h=(5×9×20×100×40×60)÷( 720×250)
h=12 m

1 5 1
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