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Water flows into a tank which is 200 m long and 150 m wide, through a pipe of cross-section (0.3m x 0.2m) at 20 km/h. In what time will the water level be 12m ?

Correct Answer: 300 hrs

Explanation:

Volume of water collected in the tank in 1 hour


⇒ (0.3 × 0.2 × 20km × 1000mts) = 1200 m cubic


If after t hours, the water is at height of 12m,


1200t=200×150×12 


⇒ t = 300 Hours.


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