Volumes Practice Test 3

Question : 19 of 40

Marks: +1, -0

A rectangular water tank is 80m × 40m. Water flows into it through a pipe 40

cm^2

at the opening at a speed of 10 km/hr. By how much, the water level will rise in the tank in half an hour?

Solution:

10km/hr = 10 ×

5/{18}

{25}/9

m/s
Length of water column in half an hour =

{25}/9 × 30 × 60

= 25 × 200 m
Since, 80 × 40 × h =

{40}/{100×100}

∴ h =

{20]/{80×40}

m =

1/{80×2}

× 100 cm =

5/8

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