Application of DerivativeHard
Question
Water is poured into an inverted conical vessel of which the radius of the base is 2 m and height 4 m, at the rate of 77 litre/minute. The rate at which the water level is rising at the instant when the depth is 70 cm is (use π = 22/7)
Options
A.10 cm/min
B.20 cm/min
C.40 cm/min
D.none
Solution
V =
πr2h 
V =
77 × 103 =
× 70 × 70 × 
(∵ 1 litre = 103 c.c.)∴
= 20 cm/min.Create a free account to view solution
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