SOLUTION: It took John 2.5 hours to run from Cinnaminson to Burlington Township at a constant speed. The return trip only took 2 hours because he increased her speed by 3 km/h. How fast wa

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Question 988319: It took John 2.5 hours to run from Cinnaminson to Burlington Township at a constant speed. The return trip only took 2 hours because he increased her speed by 3 km/h. How fast was she running from Cinnaminson to Burlington Township?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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x=original speed
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2.5x=2(x+3km/hr)
2.5x=2x+6km/hr
0.5x=6km/hr
x=12km/hr
ANSWER: The original speed was 12 km/hr.
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CHECK:
2.5hr(12km/hr)=2hr(12km/hr+3km/hr)
30km=2hr(15km/hr)
30km=30km