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Question
A river 2 m deep and 45 m wide is flowing at the rate of 3 km per hour. Find the amount of water in cubic metres that runs into the sea per minute.
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Solution
Depth of the river = 2 m
Width of the river = 45 m
Flowing rate of the water = 3 km/h
= `3 xx 1000/60` ...[∵ 1 km = 1000 m and 1 h = 60 min]
= `3000/60`
= `300/6`
= 50 m/min
The amount of water into sea per minute
= Depth × Width × Length of water of 1 min
= 2 × 45 × 50
= 4500 m3/min
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