SOLUTION: I am having trouble with this math problem. It says someone runs 2km to the bus stop to catch the bus then rides 4.5km to work. Then it says on average the bus travels 45km/hr fa

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Question 594001: I am having trouble with this math problem.
It says someone runs 2km to the bus stop to catch the bus then rides 4.5km to work. Then it says on average the bus travels 45km/hr faster than the person running at the beggining's average running speed. if the whole trip took 25 mins, how fast did the person run?
i am having problem with how to write the equation.
i tried writing f(x)=2x+4.5(45x)
but im not sure thats write. I don't know how to write "the bus travels 45km/hr faster than the person's running speed" into this equation. please help
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
t = d / r ___ the total time is 25 min or 5/12 hr

(2 / x) + [4.5 / (x + 45)] = 5/12