A train moves with a speed of 30 km/h in the first
15 minutes, with another speed of 40 km/h the
next 15 minutes, and then with a speed of 60 km/h
in the last 30 minutes. Calculate the average speed
of the train for this journey.
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Explanation:
= > average \: speed \: = \frac{total \: distance}{total \: time}=>averagespeed=totaltimetotaldistance
Distance 1 = 30×15
= 450m
Distance 2 = 40×15
= 600m
Distance 3 = 60×30
= 1800m
Total distance = 1800+600+450
= 2850m
Total time = 15 + average \: speed \: = \frac{2850}{60} = \frac{285}{6} \\ \\ = 47.5kmh {}^{ - 1}\end{gathered}averagespeed=602850=6285=47.5kmh−1
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