A river $3 m$ deep and $40 m$ wide is flowing at the rate of $2 k m$ per hour. How much water will fall into the sea in a minute?

4000 m^{3}

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3000 m^{3}

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1000 m^{3}

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2000 m^{3}

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Solution

The correct option is A $4000 m^{3}$
Flow rate $= 2 k m / h r$
$= \frac{2000}{60} m / m i n = \frac{100}{3} m / m i n$
cross $-$ section area of river $= 3 \times 40 = 120 m^{2}$

Volume of water fall in $1$ min in to sea
$= 120 \times \frac{100}{3} = 4000 m^{3}$

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