A river 5m deep and 60m wide is flowing at the rate of 6km per hour.How much water will fall into the sea in half an hour?
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Answer:
area of river = l × b
= 5× 60
= 300 m
rate of water = 6km ×5/18
=5/3 m/s
half an hour = 30 minutes = 30×60= 1800 sec
water volume = 5/3× 1800 = 3000 m
volume of water = area × rate of falling
= 300m × 3000m
= 900000 m³
1m³= 1000 litre
900000m³= 900000× 1000
900000000 litre
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