A car moves with a speed of 30km/hr^-1 for half an hour, 25km/hr^-1 for one hour and 40km/hr^-1 for two hours. calculate the average speed of the car.
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1st Case
30km/h x 1/2h = 15km
2nd Case
25km/h x 1h = 25km
3rd Case
40km/h x 2h = 80km
Total Distance = 15km + 25km + 80km = 120km
Total Time = 1/2h + 1h + 2h = 3.5h
Average speed = 120/3.5 = 34.28km/h
30km/h x 1/2h = 15km
2nd Case
25km/h x 1h = 25km
3rd Case
40km/h x 2h = 80km
Total Distance = 15km + 25km + 80km = 120km
Total Time = 1/2h + 1h + 2h = 3.5h
Average speed = 120/3.5 = 34.28km/h
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