Question

d) If a person swims 120 m in a minute. What is his speed in km/h and m/s? How much time will be
swim a distance of 45 m? With the above speed how much distance will he cover in 50 s?
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Answer 1

Explanation:

1 km = 1000 m.  So,  120 m = 120 / 1000 km

1 hour = 60 minutes. So, 1 minute = 1 / 60 hour.

1 minute = 60 seconds

Distance = 120 m = 120 / 1000 km

Time = 1 minute = 1 / 60 hour

Speed = Distance / Time

in km / h  = (120 / 1000) ÷ (1 / 60) = (120 * 60) / 1000 = 7.2 km/h

in m / s  = 120 / 60 = 2 m / s

Distance = 45 m ; Speed = 2 m/s

Speed = Distance / time

2 = 45 / time

⇒ Time = 45 / 2 = 22.5 seconds

Speed = 2 m/s   ;  time = 50 s

Speed = Distance / time

2 = Distance / 50

Distance = 50 * 2

Distance = 100 m

So, The speed in km/h is 7.2 km/h

The speed in m/s is 2 m / s

The person will take 22.5 seconds to swim a distance of 45 m

He will cover a distance of 100 m in 50 seconds.

Answer 2

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