Question

# A river $2m$ deep and $45m$ wide is flowing at the rate of $3km$ per hour. Find the volume of water that run into the sea per minute.

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Solution

## Given that rate of flow $3km/h$Depth (h) of river $=2m$Width (b) of river $=45m$Area of cross-section of river$=$Depth$×$width $=45×2\phantom{\rule{0ex}{0ex}}=90{m}^{2}$Rate of flow 3 km/h$=3×\frac{1000}{60}$ $=50m/min$Volume of water is flowing in cross-section in $1$ minute is$=90×50=4500{m}^{3}/minute$

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