1.

Water is flowing at the rate of 3 km/h through a circular pipe of 20 cm. internal diameter into a circular cistern of diameter 10 m and depth 2 m. In how much time will the cistern be filled?

A. 1 h
B. 1 h 40 min
C. 1 h 20 min
D. 2 h 40 min
Answer» C. 1 h 20 min


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