A car travels the first half of a distance
between two
places at a speed of 30 km/h and the second half of the distance at 50km/h find the average speed of the body
Answers
Answer:
Let us assume that car has total distance of 2x km.
We know distance= speed× Time
Time = distance/speed
If a car travels first half of distance with speed of 30km/h
Distance = first half distance means 2x/2 = x km
Speed= 30 km/hr
Time taken to travel first half distance = x km/30 km per hr = x/30 hrs.
The car covers remaining half distance with speed of 50 km/hr
Distance = x km
Speed = 50 km/hr
Time taken to cover second half = x km/50 km per hr = x/50 hrs
Total time to cover 2x km distance = x/30 + x/50 = 80x /1500 hrs.
Average speed of car = total distance/total time
= 2x km /80x/1500 hrs
= 2x × 1500/80 x
=3000x/80x
= 3000/80
37.5 km/hr
Explanation:
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Answer:
Let the total distance=2x
The car travel in first half=30km/hr
Time taken in first half=X/30 hour
The car travel in second half=50km/hr
Time taken in second half=X/50 hour
Average speed=Total distance traveled÷Total time taken
=2x/X/30+x/50
=2x/5x+3x/150
=2x/8x×150
=150/4
=37.5km/hr