a train covers the first half of the distance between two station at a speed of 40 km/h and the other half at 60 km/h then its average speed is :
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Let the total distance be 2x .
Time taken to cover first half = x/40 hours
Time taken to cover second half= x/60 hours
Average speed = Total distance/Total time
= 2x/ (x/40 + x/60)
= 2x / (5x/120)
= 240 / 5 = 48 km/h
Answered by
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Answer:
Let the total distance be 2x .
Time taken to cover first half = x/40 hours
Time taken to cover second half= x/60 hours
Average speed = Total distance/Total time
= 2x/ (x/40 + x/60)
= 2x / (5x/120)
= 240 / 5 = 48 km/h
Explanation:
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