Question

a river 1 m deep and 40 m wide is flowing at a rate of 3 km per hour How much water will fall into the sea in 1 minute​

Answer 1

For 1 hour

l = 3km = 3000m

h = 1m

b = 40m

.°. Amount of water it will hold each hour

= lbh

= 3000 × 1 × 40 m³

For 1 minute

Amount of water it will held in 1 minute

= Amount of water it will held in 1 hour/ 60

= 3000 × 1 × 40/60

= 1000 × 1 × 2

= 2000 m³ or 2000 kl