The water in a rectangular reservoir having a base 80m by 60m is 6.5m deep.In what time can the water be amplified by a pipe of which the cross section is a square of a side 20cm if the water runs through the pipe at the rate of 15km per hour?

A. 26hours
B. 42hours
C. 52hours
D. 65hours

C. 52hours
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