21. A river 2 m deep and 45m wide is flowing at the
rate of 3 km/hr. Find the quantity of water that
runs in to the sea per minute.
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Answer:
area of cross section of river = 2m ×45m
=90m square
flowing rate of water = 3 km/hr
=3000m/60min
quantity of water that runs into the sea per minute = 90m sq. ×3000m/60
= 4500m cu.
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