Question

The odometer of a car reads to 2000 km at the start of a trip 2400 kilometre the end of the trip if the trip took 8 hours calculate the average speed of the car in kilometres -1 and Ms -1

Answer 1

Distance=2400-2000=400km
time=8hrs
speed=distance/time=400/8=50kmph

distance=400*100=40000m
time=8*60*60=28800
speed=40000/28800=1.38m/s=1.4m/s(approx)

Answer 2

Hi user 

Here's the answer 
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Given that odometer reads 2000 km at the beginning and 2400 km at the end.

Distance covered = 2400 km - 2000 km = 400 km

Time taken for trip completion = 8 hours

Average speed = Total distance / Total time taken 

Average speed = 400 km / 8 hours 

= 50 km / hr

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To calculate in metre per second, it is

= 50 km = 50000 m

= 1 hour = 60 * 60 seconds = 3600 seconds

=> Metre / second = 50000 m / 3600 sec

= 13.88 m / sec

Hence the average speed of the car was 50 km / hr or 13.88 m / sec
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Hope my answer is correct 

Have a good day :-)