On a 120 km long track, a train travels 1st 30 km at the average speed of 30 km/h. How fast the train should travel the remaining distance so that the average speed for the entire journey is 60 km/h
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average speed is 60 km/h and total distance is 120 km
so total time taken is 120/60=2 hr
now distance covered in 1 st hour is 30 km
remaining distance is 90 km
and time 1 hr
so speed for next hr=90 km/hr
so total time taken is 120/60=2 hr
now distance covered in 1 st hour is 30 km
remaining distance is 90 km
and time 1 hr
so speed for next hr=90 km/hr
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