Find the height of the water level after 9 seconds if the water is being poured at a rate of 12 cubic meters per second into a half-empty rectangular tank with length 5 meters, width 3 meters, and height 25 meters.
A
6.0
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B
7.2
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C
18.5
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D
19.7
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E
The tank will be full and overflowing
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Solution
The correct option is C19.7 Volume poured after 9 seconds is 12×9=108 cubic meters. ⇛108=5×3×h
⇒h=365=7.2 The tank is already half filled, therefore height of water after 9 seconds is 252+7.2=19.7.