A car moves with the speed of 30 km/h for half an hour , 25 km /h for one hour and 40 km/h for two hours . Calculate its average speed .
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Hi there! Here is your answer:
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Let us find the distances first.
□ Car moves with 30 kmph for half an hour. This means 30 x 1/2 = 15 km
□ Car moves with 25 kmph for an hour. This means 25 x 1= 25 km
□ Car moves with 40 kmph for half an hour. This means 40 x 2 = 80 km
So, the total distance is 80 + 25 + 15 = 120
On, adding the hours, we have: 0.5 + 1 + 2 = 3.5 hours
□ Now we know that, S = D / T
Therefore, S = 120 / 3.5
Ans. 34.2 kmh is the average speed of the car.
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I hope this helps!
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Let us find the distances first.
□ Car moves with 30 kmph for half an hour. This means 30 x 1/2 = 15 km
□ Car moves with 25 kmph for an hour. This means 25 x 1= 25 km
□ Car moves with 40 kmph for half an hour. This means 40 x 2 = 80 km
So, the total distance is 80 + 25 + 15 = 120
On, adding the hours, we have: 0.5 + 1 + 2 = 3.5 hours
□ Now we know that, S = D / T
Therefore, S = 120 / 3.5
Ans. 34.2 kmh is the average speed of the car.
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I hope this helps!
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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.
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