Question 353812
two trains 
one train 64 kmph
other train 86 kmph
..
they are going away from each other and co-linear.
so the effective speed = 64+86 = 150 kmph 
distance = 225 km
...
time = distance/speed = 225/150
time = 1.5 hours they will be 225 km apart
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m.ananth@hotmail.ca