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?
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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
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.
:-)
