rani covers a distance of 100 km with the variable speed . for the first half of his journey the speed was 20 km/ h and during the rest of his journey speed was 40km/h. calculate the average speed of rani during the whole of his journey.
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Explanation:
First we have to find Time .
For first half of his journey
Time = Distance / Speed
= 50 /20
= 5/2 h
For remaining journey
Time = Distance / Speed
= 50/40
= 5/4 h
Average speed = Total Distance / Total Time
= 100/ (5/2 + 5/4)
= 100 / ( 10+5/4)
= 100 * 4 /15
= 400/15
= 80/3
= 26.666
= 27km/h
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