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

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

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26 hrs

52 hrs

65 hrs

42 hrs

answer is B.

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