Question

30 m/s ……= kmph

a) 108 b) 36 c) 72 d) 90
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Answer 1

Answer:

a)108 kilometres per hour

working step-We know that 1 km is equal to 1000m and that 1 hour is 60×60=3600 seconds.

30 m/s = (30×1000 m)/1000 s

We convert the above thousand to km

30 m/s = 30 km/ 1000s

Now to covert second to hour multiply and divide by 3600.

30 m/s=(30km×3600)/(1000 ×3600s)

Covert the bottom 3600 s into 1hour

30 m/s=30km×3600/1000hrs

Now just solve the extra values(3600/1000=3.6)

30 m/s=30km×3.6/h

30 m/s=108 km/h