Average Speed Help: Get to Church On Time!

[jwang023]

average speed help!

Homework Statement

On your wedding day you leave for church 33.0 minutes before the ceremony is to begin, which should be plenty of time since the church is only 10.5 miles away. On the way, however, you have to make an unanticipated stop for construction work on the road. As a result, your average speed for the first 18.0 minutes is only 5.0 mi/hr. What average speed do you need for the rest of the trip to get you to church on time?

Homework Equations

average speed= distance/ time

The Attempt at a Solution

 

[denverdoc]

One approach is to to simply figure out how far you have traveled in the first 18 minutes.

Use your eqn. Then figure out how far you have left to go, and the time available to do it. This then will dictate the average speed required to arrive on time.

 

[jwang023]

Thanks for breaking it down!

 

[denverdoc]

No problem, welcome to PF.