Water flows into a tank which is 200 m long and 150m wide , through a pipe of cross-section 0.3m x 0.2m at 20 km / hour. Then the time (in hours) for the water level in the tank to reach 8m is

Water flows into a tank which is 200 m long and 150m wide , through a pipe of cross-section 0.3m x 0.2m at 20 km / hour. Then the time (in hours) for the water level in the tank to reach 8m is
1). 50
2). 120
3). 150
4). 200

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