A tank is 7m long and 4m wide at what speed should water run through pipes 5cm

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Question

A tank is 7m long and 4m wide at what speed should water run through pipes 5cm broad and 4cm deep so that in 6 hours and 18 minutes, the water level in the tank rises by 4.5cm?

Options:

A . 12km/hr

B . 10km/hr

C . 14km/hr

D . None of these

Answer: Option B

Volume of water flown =(7 x 4 x 9/2)m³ =126 m³
Let the speed of the water be x km/hr
(x — 1000 x 63/10) x 5/100 x 4/100 = 126.
=> 63/5 x =126
=>
=> x = 10
Speed of water = 10km/hr

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