A car cover the first half of the distance between two places at the speed of 40 km/h and the second half at 60 km/h. Calculate the average speed during the whole journey.
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Answer:
48 km /h
Explanation:
Let consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,
t1 = x/2*40= x/80 hr
The time taken to complete another half distance with velocity u=60km/h
t2 = x/2*60= x/120 hr
the total time taken , t = t1+ t2
t =x/80 + x/120 = x/48 hr
The average speed of the car,
v avg = x/ x/48= 48 km/h
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