Water flows at 70 cm per second through a pipe of internal radius 1 cm into an empty cylindrical tank of base radius 70 cm and height 60 cm. How long will it take to fill the tank?
Correct answer A. 1 hour 10 minutes
Explanation
Flow = π x 1² x 70 cu cm per second. Tank = π x 70² x 60. Time = (4900 x 60) / 70 = 4200 seconds = 70 minutes = 1 hour 10 minutes.
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