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Algebra word problem

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At 9am, Katrina starts down an exercise path and walks at a rate of 4mph. At 9:30am, Carla leaves from the same place and begins chasing Katrina, catching her at 10am. Find Carla's jogging rate.
Mar 17th, 2015

the time Katrina spend on walking is 1 hr when the Carla catch her, and Carla spend 1/2 hr on walking, 

the distace katrina walks is 

4 mph*1 = 4 mile,

when Carla catch Katrina, she walks the same distance   

so  Carla's rate

is 

4mile/0.5 hr = 8 mph.   

Mar 17th, 2015

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