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Water in a river which is $3$ m deep and $40$ m wide is flowing at the rate of $2$ km/h. How much water will fall into the sea in $2$ minutes?
- (a)$800 \text{ m}^3$
- (b)$4000 \text{ m}^3$
- (c)$8000 \text{ m}^3$
- (d)$2000 \text{ m}^3$
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(c) $8000 \text{ m}^3$