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Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km / hour. How much area can it irrigate in 40 minutes,

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Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km / hour.  How much area can it irrigate in 40 minutes, if 10 cm of standing water is required for irrigation?

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Water flow in 1 hr = Area of cross - section x speed of water

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