Question

a car travel 100 metere in 50 sec. what is his speed in km/ hr

Answer 1

To convert m/s to km/hr, we multiply 18/5 to the speed in m/s.
Here, speed in m/s=100/50=2m/s
So,its speed in km/hr=2× 18/5=7. 2 km/hr.

Answer 2

a car travel 100 m in 50 sec
100 m x100km
$= 10000$
speed
$\frac{ distance }{time}$
speed
$\frac{10000}{50}$
200 per km