Question 283914
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Let *[tex \Large r] represent the rate of the train.  Then *[tex \Large r\ -\ 30] is the rate of the bus.  Since distance equals rate times time, time must equal distance divided by rate.  Since the time is the same ("...it takes a train the same time...") we can say:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{450}{r}\ =\ \frac{300}{r\ -\ 30}]


Just cross-multiply and solve for *[tex \Large r].


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