Carol S.

asked • 09/24/12

algebra equation from word problem

first train leaves station going 60 mph. 30 minutes later, 2nd train leaves same station going 72 mph. what is equation that tells us how long before 2nd train catches up with 1st train?  We know the answer is 2 hours but don't know equation to show this.

2 Answers By Expert Tutors

By:

Robert C. answered • 09/25/12

Dr. Robert can help you with Math and Science

FREDERICK S.

That should help, Robert, because you laid out all the steps.

The most important thing for this student to learn is that distance - rate*time

and the units must be compatible - minutes or hours on time; distance in miles, let's say; and thus - if hours are used - rate is in miles per hour.

IF they can manage all this, there is no stopping the trains!

[I hope there are two tracks or the secod one runs into the first one!]

Good work.

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10/19/12

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