Water flows into a tank 180 m × 140 m through a rectangular pipe of 1.2 m × 0.75 m at a rate of 15 km/h. In what time will the water rise by 4 m?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e 7 hours 28 minutes.
| Understanding | Application |
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The volume of a tank up to water level in the tank = 180 × 140 × 4 Water fill in tank = Area of the cross-section of pipe × Velocity × Time Let time is x hours The volume of a tank up to water level in the tank = Water fill in the tank 15 km = 15000 m |
1.2 × 0.75 × 15000 × x = 180 × 140 × 4 x = 112/5 = 7 hours 28 mins |