Question

A swimmer crosses a river of width 400m in 5 mins .his speed in km/hour is:

Answer 1

Hy! Gm mate..✌️

Answer 2

The speed is 4.8 km per hour.

Step-by-step explanation:

Given : A swimmer crosses a river of width 400 m in 5 mins.

To find : His speed in km/hour is ?

Solution :

The width or distance a swimmer crosses a river is 400 m.

Convert m into km,

1 m = 0.001 km

400 m = $400\times 0.001=0.4\ km$

Time taken is 5 minutes.

Convert min into hours,

$1\ min= \frac{1}{60}\ hr$

$5\ min= \frac{5}{60}=\frac{1}{12}\ hr$

Now using speed formula,

$\text{Speed}=\frac{\text{Distance}}{\text{Time}}$

$\text{Speed}=\frac{0.4}{\frac{1}{12}}$

$\text{Speed}=0.4\times 12$

$\text{Speed}=4.8\ km/hr$

Therefore, the speed is 4.8 km per hour.

#Learn more

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