Question

A river 3m deep and 40m wide is flowing at the rate of 2km/hr. How much water will fall into the sea in per minute. Pls help me fast.....

Answer 1

The river is flowing in the shape of cuboid
h =3 m
l = 2 km = 2000 m (1 km = 1000 m. 2 k m = 2×1000= 2000 m )
b = 40 m
Amount of water which will fall into the sea = Volume = l×b×h = 2000× 40× 3 = 240000 m³
This is the volume covered in hours.So we need to convert it into seconds by dividing it by 60
i.e 240000÷ 60 = 4000 m³
∴ volume = 4000 m ³
To find the amount of water in litres , we have to multiply by 1000 ( ∵ 1 m³ = 1000 l)
i.e Amount of water which will fall into the sea = 4000×1000
= 4000000 litres

Answer 2

$\huge{\gray{\boxed{\boxed{\pink{\ulcorner{\mid{\overline{\underline{\bf{Answer:-}}}}}}\mid}}}}$

The river is 3m deep, 40m wide and is flowing at the rate of 2km\hour.

$\sf\red{The \: length \: of \: water \: flow \: in \: 1min= \frac{2000}{60} }$

$\sf\pink{ = \frac{100}{3}m }$

$\sf\gray{Therefore, here \: l = \frac{100}{3}m,b =40m \: and \: h = 3m }$

$\sf\pink{Thus \: required \: volume \: of \: water= \: \frac{100}{3} \times 40 \times 3 }$

$\sf\gray{ = 4000 {m}^{3} }$