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problem solving questions help please?

two trains leave los angeles simultaneously traveling on the same track in opposite directions at speeds of 50 and 64 mph...how long will it take before they are 285 miles apart?

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Distance equals rate times time

Since they're traveling in opposite directions, their speeds add. They are separating at 50 + 64 or 114 miles per hour.

285 = 114 * t

t = 285 / 114 = 2.5 hours