1.

A conical paper cup 20 cm across the top and 15 cm deep is full of water. The cup springs a leak at the bottom and losses water at 5 cu. cm per minute. How fast is the water level dropping at the instant when the water is exactly 7.5 cm deep ?

Answer»

`(1)/(pi)cm//min`
`(1)/(5PI)cm//min`
`(1)/(2PI)cm//min`
`(2)/(3pi)cm//min`

ANSWER :B


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