Question

A car moves with a speed of 30 km/h half an hour, 25 km/h for 1 hour and 40 km/h for 2 hours. Calculate average speed of car.​

Answer 1

Answer:

Distance covered in half an hour at 30km/hr = s×t = 30×1/2=15km. Distance coveted in 1hr at 25km/hr= s×t= 25×1 =25km. Total time taken= 3hrs and 30 mins=7/2 hrs

Answer 2

Total time= 1/2 + 1+ 2
Total time=3.5hrs
Distance=speed*time
D1= 30*1/2
D1=15km

D2=25*1=25km

D3=40*2=80km

Average speed =Total distance/Total time
Average speed=(15+25+80)/3.5
Average speed=34.29km/hr