A train with a spped of 60 travels from statiin a to b and comes back to station a with a speed of 80 find average speed
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Answer: please see the photo
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Explanation:
Let the distance between stations a and b = x km
Now time taken (travelling from a to b)
=x/60 hr
Now time taken (travelling from a to b)
=x/80 hr
Total time
=(x/60 +x/80)=140x/4800 hr
Total distance
=x+x=2x km
Now average speed
=2x/(140x/4800) km/hr
=9600/140 km/hr
=68. 57 km/hr
Therefore the average speed of the train was 68.57 km/hr
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