Question

find speed when,distance is 142km and is 2hours

Answer 1

speed is equal to distance divided by time. Therefore speed is 142/2 which is equal to 71 km/h. The unit is very important.

Answer 2

Given :

Distance 'd' = 142km

Time 't' = 2hr

To Find :

Speed 's'

Solution :

Speed is the ratio of distance traveled by a body to the time taken by the body to travel that distance.

  Speed = Distance / Time

           s = d / t

We have;

Distance 'd' = 142km = 142000m

Time 't' = 2hr = 7200s

Therefore;

Speed 's' = d/t = 142km / 2hr  or  142000m / 7200s      

            s = 71km/hr  or  19.722m/s

The speed is 71km/hr or 19.722m/s