A train went 300 miles from Dhaka to Khulna at an average rate of 80 mph. At what speed did it travel on the way back if it's average speed for the whole trip was 100 mph?
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average speed for same distance is given by (2*v1*v2)/(v1+v2)
2*80*v2/80+v2=100
160v2=8000+100v2
60 v2=8000
3v2=400
v2=400/3
2*80*v2/80+v2=100
160v2=8000+100v2
60 v2=8000
3v2=400
v2=400/3
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