Question

A river 3m deep and 40m wide is flowing at the rate of 2 km per hour how much water will fall into the sea in a minute​

Answer 1

i have solve it in my copy before

Answer 2

$speed \: of \: water \: flow = 2 \frac{km}{h} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times \frac{1000}{60} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{100}{3} \frac{m}{min} \\ it \: means \: it \: cover \frac{100}{3} \: m \: distance \: in \: \\ one \: min. \\ so \: water \: flow \: in1min = \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 3 \times 40 \times \frac{100}{3} \times 1 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: =4000 {m}^{3} = 4000kl$