Water flows into a tank which is 200m long and 150m wide,

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

Water supplied by pipe in 1 hour = (0.3 × 0.2 × 20 × 1000) cubic metre
= 1200 cubic metre

∴ Total time =	Volume of water to be filled in the tank
	1200

=	200 × 150 × 8	= 200 hours
	1200