Question 193333
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#1 and #3 are done correctly.  You have the correct answers for #2, but you really don't show how you got them.


Express train:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \  d = v_1t]


Local train:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ d = v_2(t + 2)]


and


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ v_1 = 2v_2]


Since the distances are the same:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2v_2t = v_2(t + 2)]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2v_2t - v_2t = 2v_2]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ v_2t = 2v_2]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ t = 2]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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