Question

The distance between 2 stations is 216 km. A bus takes 3 hours to cover this distance. Calculate the average speed of the bus in m/s.

Answer 1

average velocity(v) = displacement/time
⇒v = 216/3 v = 72 km/hr
⇒v = 72 × 1000 m / 3600 s (1 km = 1000 m  and 1 hr = 60 x 60 sec, we can also multiply it with 5/18 as we see 1000 m / 3600 hr = 5 m/18 s)
⇒v = 2 × 1000 m / 100 s
⇒v = 20 m/s

Answer 2

Answer:

average velocity(v) = displacement/time

⇒v = 216/3 v = 72 km/hr

⇒v = 72 × 1000 m / 3600 s (1 km = 1000 m  and 1 hr = 60 x 60 sec, we can also multiply it with 5/18 as we see 1000 m / 3600 hr = 5 m/18 s)

⇒v = 2 × 1000 m / 100 s

⇒v = 20 m/s

Explanation: