SOLUTION: One train done distance of 60km at 60km per hour. and return time same distance but speed is 40km per hoour. what is the average speed of the train?

Question 759782: One train done distance of 60km at 60km per hour. and return time same distance but speed is 40km per hoour. what is the average speed of the train?
Found 2 solutions by sachi, Cromlix:
Answer by sachi(548) (Show Source): You can put this solution on YOUR website!
ongoing travel
the distanc= 60 km & speed =60 kmph
so the time=dist/speed=60/60=1 hr
return journey
the distanc= 60 km & speed =40 kmph
so the time=dist/speed=60/40=1.5 hrnow the total dist=60+60=120 km
& total time=1+1.5=2.5 hr
so the av speed =totaldist/total time=120/2.5=48 kmph

Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
Total Average Speed = (2 * Speed 1 * Speed 2)/ (Speed 1 + Speed 2)
= ( 2* 60 * 40)/ (60 + 40)
= 4800/100
= 48 kmph
Hope this helps.
:-)
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