Answers

2016-01-25T19:59:36+05:30
Area of cross section of river= 2 x 45 = 90 m^2
so, water flowing into the sea= area of cross section x rate of flowing water
                                               = 90 x 3000
                                               = 270000 m^3
there water flowing per minute= 270000 / 60 = 4500 m^3
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2016-01-25T20:00:33+05:30
The quantity of water that is running in the river=Volume of the river
h=2m
b=45m
3km/h=3*5/18m/s=5/6m/s
therefore in one sec 5/6m of water flows in the river
l=5/6m
volume=lbh=2*45*5/6
=15*5=75cu.m=75000litres
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