A car moves with a speed of 30km/h for half an hour and 25km/h for one hour and 40km/h for 2 hour . Calculate the average speed
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A car moves with 30 km/h for 30 min
means the car trvelled only 15km (i)
In 2nd case the travels 25km/h for one hour
means the car travel 25km (ii)
In 3rd case the car travels 40km/h for 2 hours
means the car travles 40×2 = 80km
avg. speed - total distance travelled/ total time taken
1200m/ 210
= 5.7 km/h
means the car trvelled only 15km (i)
In 2nd case the travels 25km/h for one hour
means the car travel 25km (ii)
In 3rd case the car travels 40km/h for 2 hours
means the car travles 40×2 = 80km
avg. speed - total distance travelled/ total time taken
1200m/ 210
= 5.7 km/h
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