Question

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

Answer 1

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Volume passing in an hour = $2\times 45\times 3000\times 1$

$=270000m^3/hour$

Volume passing in 1 min.

1 min = $\frac{1}{60}$ hours.

$\therefore$ volume passed = $270000\times \frac{1}{60}$

$=45000m^3$