Question

A river 3.5m deep and 28m wide is flowing at the rate of 2.4km/h. How many litres of water will flow into the sea in 10minutes

Answer 1

2.4 km/h=2400m/h
2400/60=40m/min
water flowing in the sea in 10 min = lbh*10
28*40*3.5*10 = 39200m3

Answer 2

Answer:

39200000 liters of water will flow into the sea in 10 minutes

Step-by-step explanation:

Depth of river = 3.5 m

Width of river = 28 m wide

Area of cross section of the river = $3.5 \times 28 = 98m^2$

Rate of flow of water = 2.4km/h = $2.4 \times \frac{1000}{60} = 40 m/min$

Volume of water flowing through this cross section in every minute:

=  $Area \times rate$

= $98 \times 40$

 = $3920$

Volume of water flowing through this cross section in 10 minutes:

= $3920 \times 10$

= $39200$

Since 1 cubic m  = 1000 liters

So,  39200 cubic m  = $39200 \times 1000$

                                   = $39200000$

Hence 39200000 liters of water will flow into the sea in 10 minutes