SOLUTION: Julie left her house and drove toward work at an average speed of 45 mi/h. Rob left some time later driving the same direction at an average speed of 60 mi/hr. After driving for 4

Question 1086277: Julie left her house and drove toward work at an average speed of 45 mi/h. Rob left some time later driving the same direction at an average speed of 60 mi/hr. After driving for 4 hours Rob caught up with Julie. How long had Julie been driving when Rob caught up with Julie? (Round to the nearest tenth)
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Julie's head start in miles
Let = Julie's head start in hrs
----------------------------------------
Start a stop watch when Rob leaves
Let = distance in miles that Rob travels
until he catches up with Julie
------------------------------
Rob's equation:
(1)
Julie's equation:
(2)
---------------------------
Plug (1) into (2)
(2)
(2)
----------------------------
How much is Julie's head start in hours?

hrs
--------------------
Then Julies drives for more hrs, so

Convert hrs to minutes
min
-------------------------
Julie had been driving for 5 hrs and 20 min
when Rob caught up with her

RELATED QUESTIONS
Jose left the white house and drove toward the recycling plant at an average speed of 40... (answered by checkley77)

Jose left the White House and drove toward the recycling plant at an average speed of 40... (answered by josmiceli)

Jose left the White House and drove toward the recycling plant at an average speed of 40 (answered by josgarithmetic)

John left his house and drove toward Tampa at an average speed of 40 km/h. Rob left... (answered by richwmiller)

Josh left campus and drove toward San Francisco at an average speed of 40km/h. Rob left... (answered by josgarithmetic)

jose left the white house and drove towards the recycling plant an a average speed of 40... (answered by htmentor)

jose left the White House and drove toward the recyling plant at an averge speed of... (answered by CharlesG2)

Brenda left the science museum and drove toward her cabin on the lake at an average speed (answered by josmiceli)

Shayna left the airport and drove toward the capital at an average speed of 52 km/h. Some (answered by ankor@dixie-net.com)