Two trains start from the same station at the same time and travel in opposite directions. One
train travels at an average rate of 40 mph, the other at 65 mph. In how many hours will they be
315 miles apart?
Choose one
A) 1 hour B) 2 hours C) 3 hours D) 4 hours E) 5 hours
First we’ll make the d=rt chart. But we won’t fill in the d.   d = r x t   Train 1 40 x   Train 2 65 x   The reason we have an x in the time column is because they left at the same time and will be 315   at the same time. In other words, their times are equal.   Now, the big question. Are there distances equal? Since they do not meet the criteria in a TYPE   A problem, the answer is no. That means the sum of the distances must be equal to a number.   D1 + D2 = #   40x + 65 = 315   105x = 315   x = 3 It will take three hours.   correct answer 3 hours
<result>C</result>
Two trains start from the same station at the same time and travel in opposite directions. One
train travels at an average rate of 40 mph, the other at 65 mph. In how many hours will they be
315 miles apart?