SOLUTION: Dawn & Julia are running on a jogging trail. Dawn starts running 5 minutes after Julia does. If Julia runs at an average speed of 8 ft/s & Dawn runs at an average speed of 9 ft/s,

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Question 668881: Dawn & Julia are running on a jogging trail. Dawn starts running 5 minutes after Julia does. If Julia runs at an average speed of 8 ft/s & Dawn runs at an average speed of 9 ft/s, how many minutes after Dawn starts running will she catch up with Julia?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Dawn starts running 5 minutes after Julia does.

Julia runs at an average speed of 8 ft/s : 480ft/min 

Dawn runs at an average speed of 9 ft/s :  540ft/min

how many minuteshighlight%28x%29 after Dawn starts running will she catch up with Julia

Translate into an equation: Note: Distance the same for both.  D= rt

 Dawn D = Julia D

  540*x = 480(x+5)

    (60ftpm) x = 2400ft 

      x = 40min