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## Comment on

Introduction to GMAT Motion Questions## The easy questions in the

Thanks

## This first lesson serves as

This first lesson serves as an introduction to motion problems. In total, there are 4 videos lessons on motion questions. So, if you're having difficulties with the linked questions above, you might want to watch all 4 lessons first and then return to these questions.

## Awesome thanks

## can we solve this question

## Question link: https:/

Question link: https://gmatclub.com/forum/teneka-and-francis-leave-town-a-at-9-00-a-m-d...

Actually, 10 mph is the EXPANSION rate (not the shrink rate). Since they both start at the same point, and since Francis is traveling 40 mph and Teneka is traveling 30 mph, their distance apart EXPANDS by 10 miles every hour.

However, once Francis' car breaks down and stops, the shrink rate is no longer 10 mph. At this point, Francis' speed is 0 mph and Teneka's speed is 30 mph. At this point, their distance apart SHRINKS at a rate of 30 miles each hour.

Does that help?

Cheers,

Brent

## right expansion rate. i

my problem is that the question looked perfect for going the shrinking or expansion route since it provided two speeds. it is kind a confusing to differentiate when i should approach a problem using the expanding/shrinking approach vs not using it.

thanks.

## We can definitely use the

We can definitely use the strategies for shrinking and expanding gaps.

For the first 240 miles of Francis's trip, we have an expansion scenario (where the expansion rate = 10 mph)

Once Francis' car breaks down and stops, we have a shrinking scenario (where the gap shrinks at a rate of 30 mph)

Does that help?

Cheers,

Brent

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