A CYLINDRICAL WATER TANK, WITH DIAMETER 2.8 M AND HEIGHT 4.2 M, IS...

7. - Đề thi Toán IMSO2018 ở Thường Châu, Trung Quốc

Toán Đề thi Toán IMSO2018 ở Thường Châu, Trung Quốc

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7. A cylindrical water tank, with diameter 2.8 m and height 4.2 m, is filled in by a

pipe of diameter 7 cm, through which water flows at the rate of 4 m/sec.

How many minutes will it take for the pipe to completely fill the tank?

(Take ²²

π = 7 )