SOLUTION: A group of tourists were supposed to cover an 18 km distance in a certain amount of time. However they actually traveled at a speed which was .5 km/hour greater than what they had

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Question 1003679: A group of tourists were supposed to cover an 18 km distance in a certain amount of time. However they actually traveled at a speed which was .5 km/hour greater than what they had actually planned and thus arrived a half an hour early. What speed had the tourists planned to go at?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
             rate     time      distance
EXPECTED      r         t         d
ACTUAL       r+0.5     t-1/2      d

system%28rt=d%2C%28r%2B1%2F2%29%28t-1%2F2%29=d%29


STEPS, NOT DONE TO COMPLETION
rt%2Bt%2F2-r%2F2-1%2F4=d
d%2Bt%2F2-r%2F2-1%2F4=d
t%2F2-r%2F2-1%2F4=0

Note in the description, d=18, so some use of rt=d or rt=18 will allow you to eliminate either t or r to solve for either r or t.