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15. Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km/hour. How much areacan it irrigale in 10 minutes, if 10 cm of standing water is required for irrigation?ncentric circles with centre O have radu 21 crn and 42 cm. If / AOB = 6(P, |
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Answer» B= 5.4 mh=1.8m v= 25 km/htherefore, l=25km per hourtherefore water that would be flowing in 40 minutes=40*25/60=50/3km=50000/3m area of irrigation= area water flowing in 40minutesvolume of water which irrigates the land= volume water flowing from canal in 40 minutes and 10 cm or 1/10 m of standing water is required for irrigationtherefore,l*b*h=L*B*Hl*b*1/10=50000/3*5.4*1.8l*b=300000*5.4l*b=16200000sq. mtherefore, area to be irrigated when 10 cm of standing water is required=16200000sq. m |
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