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Water flows into a tank 200 m x 160 m througb a rectangular pipe of 1.5m x 1.25 m @  20 kmph . In what time (in minutes) will the water rise by metres?

A. 50 min

B. 55 min

C. 90 min

D. 96 min

Correct Answer :

D. 96 min


Volume required in the tank = (200 x 150 x 2) m3 = 60000 m3
Length of water column flown in1 min =(20*1000)/60 m =1000/
 Volume flown per minute = 1.5 * 1.25 * (1000/3) m3 = 625 m3.


 Required time = (60000/625)min = 96min