Question

A tortoise moves a distance of 100m in 15 minutes what is its average speed in kilometre per hour

Answer 1

distance=100m=0.1km

time=15minutes=15/60=0.25h

average speed=0.1/0.25

=0.4km/h

Answer 2

Given- 100m in  15min (900 seconds)

15min x 4 = 60 min or 1 hour

100m x 4 = 400m or 400/1000km

--> 0.4km

hence the speed in kmph is 0.4km per hour

Note - to convert in km/hr the forumla is to multiply the Rate in m/s by 5/18