Posted by **Jerald** on Tuesday, November 12, 2013 at 8:54pm.

Mark and Sandy are participating in a Bike-a-Thon for charity. Mark oversleeps, so Sandy gets a one hour head start and bikes at a speed of 12 miles per hour. To catch up to Sandy, Mark decides that he needs to bike at a speed of 15 miles per hour.

1. Make a chart that shows how far Mark and SAndy ride their bikes during the first three hours of the Bike a thon

Hour 1: Mark 15mph Sandy 12mph

Hour 2: Mark 30mph Sandy 24mph

Hour 3: Mark 45mph Sandy 36mph

- Math -
**Ms. Sue**, Tuesday, November 12, 2013 at 8:59pm
You missed the fact that Sandy had a one hour head start.

At the end of:

Hour 1: Sandy -- 12 m; Mark 0

Hour 2: Sandy -- 24 m; Mark 15

Hour 3: Sandy -- 26 m; Mark 30

- Math -
**Jerald**, Tuesday, November 12, 2013 at 9:03pm
Thank you.

2. WRite an expression that represents Sandy's journey. Be sure to define your variables

t=hour

12t + 12

- Math -
**Ms. Sue**, Tuesday, November 12, 2013 at 9:09pm
You're welcome.

12t

- Math -
**Jerald**, Tuesday, November 12, 2013 at 9:16pm
But didn't she have a one hour head start so she would have had an extra 12 m?

- Math -
**Ms. Sue**, Tuesday, November 12, 2013 at 9:28pm
You just need an expression that represents her journey. It doesn't make any difference what time she started.

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