The level of water in a vessel falls from a height 81 cm to 25 cm in 5 minutes as water flows out through a hole in its bottom. What further time is required for the water level to fall from 25 cm to 4 cm ?

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3.75 minutes

2 minutes

8 minutes

10 minutes

answer is A.

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Detailed Solution

t1t2=[H1−H2H2−H 21] 5t2=[81−2525−4] ⇒t2=3.75min

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