A car covers first 2km of the total distance of 4km with the speed of 30km per hourAnd other 2km covers with the speed of20kmper hour what is the average speed of car
Answers
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Distance travelled = S₁ = 2 km
Speed = v₁ = 30 km/hr
Time taken = t₁ = S₁/v₁ = 2/30 = 1/15 hr
Distance travelled = S₂ = 2 km
Speed = v₂ = 20 km/hr
Time taken = t₂ = S₂/v₂ = 2/20 = 1/10 hr
We know that,
Average speed = Total distance / Total time
In the given case,
Total distance = 4 km
Total time = 1/15 + 1/10 = (2+3)/30 = 5/30 = 1/6 hr
Hence,
Average Speed = 4/(1/6) = 4×6 = 24 km/hr
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Answer:
24 km/hr
Explanation:
Given :
- 2 km was covered with a speed of 30 km/h
- Other 2 km was covered with a speed of 20 km/h
To find:
- Average speed of the car
Average speed = total distance / total time
Total distance = 2+2 = 4 km
Time = distance / speed
Time 1 = 2/30
Time 2 = 2/20
Average speed = 4/ 2/20+2/30
Average speed = 4/ 6/60+4/60
Average speed = 4/10/60
Average speed = 4/10×60
Average speed = 24 km/hr
The average speed of the car is equal to 24 km/hr