Experts answer it ASAP....

Dear student,
If V be the volume of liquid in the cylinder, at a height h of the water level then V=πr²h.
Differentiating both sides w.r.t time t,
we get dVdt=πr²dhdt
⇒Q=πr²dhdt or dhdt=πr²Q
Note the dVdt represents the rate at which the volume of liquid in the cylinder increases, which is same as the rate of pouring of water through the tap.

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