Explanation:
According to the given question,
d = distance = 200 m
t = time = 24 sec
s = speed
And we are asked to find speed in km/h.
We know,
speed = distance/time
s = d/t
Putting the values we get,
s = 200/24
s = 8.33 m/s
Now, to convert it into km/h,
We know,
1 km = 1000 m
1 m = 1/1000 km
Similarly,
1 sec = 1/3600 hr
s = 8.33 m/s
s = 8.33 ×3600 /1000
s = 29.98 km/h
Thus speed of the boy is 29.98 km/h or 30 hours