Water flows at 5 km/h through a pipe of internal radius 7 cm into a rectangular tank 50 m long and 44 m wide. Taking π = 22/7, in how many hours will the water level in the tank rise by 21 cm?
Correct answer A. 6 hours
Explanation
Flow per hour = 22/7 x 0.07 x 0.07 x 5000 = 77 cu m. Water needed = 50 x 44 x 0.21 = 462 cu m. Time = 462 / 77 = 6 hours.
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