SOLUTION: Bill left school and drove toward the train station. One hour later Jessica left driving at 80 km/h in an effort to catch up to Bill. After driving for 3 hours Jessica finally caug

Question 996373: Bill left school and drove toward the train station. One hour later Jessica left driving at 80 km/h in an effort to catch up to Bill. After driving for 3 hours Jessica finally caught up. Find bills average speed
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Common form of travel rates exercise.

Most directly related. http://www.algebra.com/my/Uniform-Rates-Travel%3A-same-direction-but-different-travel-times-meet-when%3F.lesson?content_action=show_dev

http://www.algebra.com/my/Uniform-Rates-Travel%3A-Two-Speeds-Differ-by-Constant-Same-Distance.lesson?content_action=show_dev

Analyzing your example, Jessica traveled 3 hours, and if she left 1 hour AFTER Bill, then Bill traveled 3+1 hours. We can make this data table:

         speed    time     distance
BILL       r       3+1      d
JESSICA    80      3        d

Simple substitution for d.

RELATED QUESTIONS
maria left the mall and drove north. jimmy left one hour later driving at 24 km/h in an... (answered by solver91311,josmiceli,josgarithmetic,greenestamps)