Question

please anyone solve this problem​
.....

Answer 1

Answer:

given

a river 3m deep and 40m wide is flowing at the rate of 2km per hour

area of cross section of the river=3*40=120m square

now volume of water flowing through this cross section in every minute=area*rate

120*2 km/hr

=120*

(2000/60)m/min

=2*2000

=4000mcube

since 1mcube = 1000 litres

so

4000mcube =4000*1000 litres

=4000000 litres

SO IN 1MIN WATER WILL FALL INTO THE SEA IS 4000000 LITRES

that was a nice question

Answer 2

SOLUTION:-

We have,

•Water flowing in river in 1 hour= 2km.

Water flowing in river in 1 hour=2000m

[1 km= 1000m]

•Water flowing in river in 60 minutes;

=) 2000m

Therefore,

Water flowing in river in 1 minutes,

=) 2000/60

=) 100/3m

Now,

Area of cross section of the river:

=) 3m × 40m

=) 120m²

So,

The volume of water flowing through this cross section in every minute

=) Area × Water flowing

$= > 120 \times \frac{100}{3} \\ \\ = > \frac{12000}{3} \\ \\ = > 4000 {m}^{3}$

Since,

•1m³ = 1000litres.

4000m³ = (4000× 1000)litres

=) 4000000litres

Thus,

Water fall into sea in 1 minutes= 4000000 litres.

Hope it helps ☺️