Question

distance= 72 km, time= 3 hrs. what is the speed in SI units​

Answer 1

$speed = \frac{distance}{time} \\ speed = \frac{72}{3} \\ speed = 24km$

24km/s

Answer 2

3hrs = 3 x 3600 seconds=

10800 seconds

72km=72 x 1000 metres=

72000 metre

speed=distance÷time

=72000÷10800

6.66 metre/second