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

Heya,

Total distance covered by the car (in km) = 2400km - 2000 km
= 400 km 

Total time taken taken by the car (in hrs) = 8 hrs

Average speed = Total distance covered/ total time taken 

= 400km/8hr

=50 km/hr

Total distance covered by the car (in m) = 400000m

Time taken (in s) = 28800 sec

Average speed = 400000/28800
= 13.89 m/s

Hope it helps u............

Answer 2

Heya,

Initial reading = 2400 km
Final reading = 2000 km

Total distance covered   = Final reading -Initial reading 
                                    =  2400km - 2000 km
                                    = 400 km 

Total time taken  = 8 hrs

Average speed = Total distance traveled/ total time taken 

                         = 400km/8hr

                        = 50 km/hr
To convert to m/s , multiply it by 5/18

50 x 5/18 = 13.89 m/s [ approx.]

Average speed = 50 km/hr = 13.89 m/s