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The level of water in a vessel falls from a height 64cm to 36cm in 3 minutes as water flows out through a hole in it’s bottom. At the end of next 2 minutes the height of water level in the vessel will be.

a
16.4 cm
b
21.8 cm
c
32.4 cm
d
42.6 cm

detailed solution

Correct option is B

t    α h1-h2             32=64−3636−h⇒32=8−66−h=26−h            4=18−3h            3h=14⇒9×h=14×14⇒h=14×149                ∴h=1969=21.8cm

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