Question

The odometer of a car reads 2000 km at the start of a trip and 2400km at the end of the

trip. If the trip took 8 hr, calculate the average speed of the car in km/hr and m/s.

Answer 1

Total distance=2400km-2000km=400km=400000m
Total time=8hr=28800seconds
Avg.Speed in km/hr=total distance/total time
 →$\frac{400}{8}$=50km/hr
Avg.Speed in m/s=total distance/total time
=$\frac{400000}{28800}$
=13.89m/s

Answer 2

@

Distance travelled by the car :-
✒ 2400-2000
✒ 400km

✒ In metre
✒ 400×1000
✒ 400000 m

Time taken :-
✒ 8 hours

✒ In second
✒ 8×60×60
✒ 28800 sec

(1) Average speed in km/hr :-
✏ 400/8
✏ 50 km/hr

(2) Average speed in m/s :-
✏ 400000/28800
✏ 4000/288
✏ 13.8 m/s

@:-)