Question 180134
 a bicyclist and a hiker leave the same place at the sametime and travel in the same direction. The bicyclist travels three times as fast as the hiker. At the end of 3 hrs they are 24 miles apart. How fast does the hiker travel. 
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The hiker moves at r mph, the cyclist at 3r mph.
After 3 hours, the hiker has travelled 3r miles, the cyclist 9r miles.
9r - 3r = 24 miles
6r = 24
r = 4mph, the hiker's speed.