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CBSE Class 10 Answered

Waterin a canal, 30 dm wide and 12 dm deep is flowing with the velocity of 10 km/hr. How much area will it irrigate in 30 minutes, if 8 cm of standing water is required for irrigation?
Asked by | 26 Jan, 2014, 07:08: AM
answered-by-expert Expert Answer
Width of the water canal = 30 dm = 30 x 10 cm = 300 cm Depth of the canal = 12 dm = 12 x 10 cm = 120 cm Velocity of the water = 10 km/hv = (10 x 1000 x 100)/60 cm/minute That is velocity of the water = (100000/6) cm/minute Distance covered in 30 minutes = 30 x (100000/6) = 500000 cm Volume of water = 500000 x 300 x 120 = 18,00,00,00,000 cubic centimeter Area irrigated by this water if 8 cm standing water is desired = (500000 x 300 x 120 /8) sq cm = 2,25,00,00,000 sq cm = 2,25,000 sq m =0.225 sq km
Answered by | 29 Jan, 2014, 04:37: PM

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