Calculate the average speed of train if it travel Muzaffarpur junction to Barauni junction with the speed of 150 kilometre per hour and and return with a speed of 90 km per hour.
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Answer:
225km/hr
Explanation:
Distance from Muzaffarpur junction to Barauni junction :
Speed = 150km/h
Distance = x
Time = Distance /speed = x/150
Distance from Barauni junction to Muzaffarpur junction:
Speed = 90km/hr
Distance = x
Time = distance /speed = x/90
Average speed = Total distance / total time taken
= 2x / x/150 + x/90
= 2x / 3x+5x/450
= 2x / 8x /450
= 225 km/hr
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