A car travels first 300 kms at an average rate of 20 kmph and further travels the same distance at an average rate of 60 kmph. Determine the average speed of the car over the whole journey.
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speed of car in first phase = 20kmph
total distance covered = 300 km
time taken to cover 300 km at a speed of 20 kmph = 300/20 = 15 hrs
speed in second phase = 60 kmph
total distance covered = 300km
time taken to cover distance 300 km at a speed of 60 kmph = 300/60 = 5hrs
then , average speed = total distance covered/total time taken
= 300+300/15+5
= 600/20
= 30 kmph
so the average speed = 30kmph
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