a car moves with a speed of 30 km/ h for half an hour 25 km / h for one hour and 40 km/ h for two hourz . calculate the average speed of the car
Answers
Answered by
1
Answer:
34.28km/hr
Explanation:
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
Answered by
0
Answer:
speed=30km/h
time=0.5hrs
distance=s*t
=15km
speed=25km/h
time=1hrs
distance=s*t
=25km
speed=40km/h
time=2hrs
distance=s*t
=80km
average speed= total distance/total
time taken
= (15+25+80)/(1+2+0.5)
= 120/3.5
= 34.28km/h.
Explanation:
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