Question 694338
a train leaves a station and travels north at a speed of 75mph. four hours later, a second train leaves on a parallel track and travels north at 175mph. how far from the station will they meet.


Let distance from station be D
Time taken by 1st train to travel to "meeting" point, equals time taken by 2nd train to travel to "meeting" point, plus 4, OR


{{{D/75 = D/175 + 4}}}
7D = 3D + 2,100 ------ Multiplying by LCD, 525
7D – 3D = 2,100
4D = 2,100
D, or distance from station = {{{2100/4}}}, or {{{highlight_green(525)}}} miles


You can do the check!!


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