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?

A. 12km/hr
B. 10km/hrCorrect Answer
C. 14km/hr
D. None of these
Correct Option: B. 10km/hr

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