water in a canal, 6cm , wide and 1.5 m deep is flowing with a speed of 10km/h. how much area will it irrigate in 30 minitues if 8cm of standing water is needed?
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Answer:
Breadth = 1.5m, Depth/height = 6m, speed = 10km/h
length of canal in 1 hour = 10km
length of canal in 30 min =
60
30×10
=5km=5000m
Volume of canal =l×b×h=5000×1.5×6m
3
Volume of water in canal = Volume of area to be irrigated
⇒5000×6×1.5= Area irrigated × height
⇒Area irrigated =
8
45000×100
{∵h=
100
8
m}
⇒Area irrigated =562500m
2
=56.25 hectares
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