Question

A river3 meter deep and 40 m wide is flowing at the rate of 2km/h. How much water will fall into sea in 10 minutes

Answer 1

So, in order to answer this question, let us analyse the given data

it says that the depth = 3 metres

                         width = 40 metres

and the rate of flow = 2 km per hour( converting this into metre per second, we get rate of flow = 2*(1000/3600)=2*(5/18)= 0.55 metre per second)

now we know that volume = length *width*height

similarly, volumetric rate of flow = length*width*rate of flow

which leaves us at v=3*40*0.55= 66.67 metre cube per second.

so the amount of flow per minute would be given by

 66.67*60 = 4000 metre cube per minute
4000000

pls do let me know if the answer helped

Answer 2

The volume of the cuboid (river) = L × B × H

The distance Travelled by the river = 2000 m × 1/6

= 1000/3

= 3 *40* 1000/3

= 40*1000

= 40000 m^3