Question

the odometer of a car reads 2000km at the start of atrip and 2400 km at the end of the trip if the trip took 8 h calculate the average apeed of the car in km /h and m/ s.
answer is here
Distance covered by the car
s=2400 km - 2000km =400km
time elapsed,t= 8 hour
average speed of the car is,
v = s / t = 400km /8hour
= 50 km /h
50 km /h × 1000m/1km × 1h/ 3600 sec
13.9 m /s answer​

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