SOLUTION: Coleen and Justin go out for a bicycle ride. They leave from the same place riding in opposite directions. Justin is riding 10 miles per hour faster than Coleen. After riding for 6

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Question 923995: Coleen and Justin go out for a bicycle ride. They leave from the same place riding in opposite directions. Justin is riding 10 miles per hour faster than Coleen. After riding for 6 hours, they are 180 miles apart from each other. At what speed was Justin riding?
Answer by KMST(5328) (Show Source):
You can put this solution on YOUR website!
Defining a variable (what I would write first):
= Coleen's speed in miles per hour.

Reasoning (no need to write all this):
= Justin's speed in miles per hour. (You may or may not =want to write that).
So, the distance between Coleen and Justin starts at zero,
and increases at a rate of miles per hour.
So, after hours, the distance between them must have increased to times the rate of increase above.

Writing an equation (what I would write next):

Solving:
(you can skip this line)

is Justin's speed in miles per hour.

NOTES:
There are many ways to get the the same answer.

If just a fast answer and no work is required,
I would think through

and maybe would try to do it without even picking up a pen or pencil.

Your teacher may be partial to
= Justin's speed in miles per hour.
= Coleen's speed in miles per hour.
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