Question

a swimmer cross a river of width 400 metres in 5 minutes.his speed in kilometre/hour is​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

$speed = \frac{distance}{time}$

$1km = 100m$

$1m = \frac{1}{100} km$

$400m = \frac{400}{100} m$

$1hour = 60minutes$

$1minute = \frac{1}{60} hour$

$5 \: minutes = \: \frac{5}{60} hours$

$= \frac{1}{12} \: hours$

$speed = \frac{distance}{time}$

$speed = \frac{4}{ \frac{1}{12} }$

$speed = 4 \times 12$

speed = 48 km / hr