The level of the water in a vessel falls from a height 81cm to 49cm in 5 minutes as water flows through a hole in it’s bottom. What further time is required for the water level to fall from 49 to 25 cm ?

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10 minutes

5 minutes

20 minutes

2.5 minutes

answer is B.

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Detailed Solution

t=Aa2g(h1−h2) t∝h1−h2⇒t1t2=h1−h2h11−h21=81−4949−25=9−77−5=22,t2=t1 t2=5min

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