<PRE><B>Question 766272</B>
A local train leaves a city, traveling east at 70 km/h. One hour later, an express train leaves the same station on a parallel track at 120 km/h. How far from the city will the trains meet?
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let x=travel time(hrs) of 120 km/h train
x+1=travel time(hrs) of 70 km/h train
distance=speed*travel time(same for both trains)
..
{{{120x=70(x+1)=70x+70}}}
50x=70
x=7/5
distance=7/5*120=168 km
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