<PRE><B>Question 62030</B>
When a train left Podunck and traveled West 70 KM/H, 2 hours later, another train left Podunck and traveled East at 90KM/H, how many hours had the first train traveled when they were 1420 KM apart?
:
Let t = westbound train time:
Let (t-2) = eastbound train time:
:
Dist = speed * time
:
70t + 90(t-2) = 1420
70t + 90t - 180 = 1420
160t = 1420 + 180
160t = 1600 
t = 1600/160
t = 10 hrs the westbound train:
:
Check: 70(10) + 90(8) = 1420
:

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