A car moves with a speed of 30km/h for half an hour, 25km/h for one hour and 40km/h for two hours, calculate the average speed of the car.
Answers
Answered by
1499
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.
Distance covered in 2 hrs at 40km/hr=s×t= 40×2=80km
Therefore, total distance covered= 15+25+80=120km
Total time taken= 3hrs and 30 mins=7/2 hrs.
Therefore, average speed=total distance covered/total time taken = 120×2/7 = 34.28km/hr
Distance coveted in 1hr at 25km/hr= s×t= 25×1 =25km.
Distance covered in 2 hrs at 40km/hr=s×t= 40×2=80km
Therefore, total distance covered= 15+25+80=120km
Total time taken= 3hrs and 30 mins=7/2 hrs.
Therefore, average speed=total distance covered/total time taken = 120×2/7 = 34.28km/hr
Answered by
29
Explanation:
Let,
Avarage speed= totaldistance/total time
Distance covered= 30 ×1/2+25+140×2=120km.
Time taken = 0.5 +1+2 =3.5hour
Hence,
Avarage speed =120/3.5=34.286km/h
Hope ít hélps yóú
Similar questions