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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?**

50 min

55 min

90 min

96 min

D. 96 min

Volume required in the tank = (200 x 150 x 2) m^{3} = 60000 m^{3} Length of water column flown in1 min =(20*1000)/60 m =1000/

Volume flown per minute = 1.5 * 1.25 * (1000/3) m^{3} = 625 m^{3}.

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