w + r = 6 ... 3 w + 3 r = 18
3 w + 45 r = 207
subtract equations to eliminate w
Jim began a 207 mile bicycle trip to build up stamina for a triathlon competition. Unfortunately, his bicycle chain broke, so he finished the trip walking. The whole trip took 6 hours. If Jim walks at the rate of 3 miles per hour and rides 45 miles per hour, find the amount of time he spent on the bicycle
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