Question 1128850
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 237​-mile bicycle trip to build up stamina for a triathlete competition.​ Unfortunately, his bicycle chain​ broke, so he finished the trip walking. The whole trip took 7 hours. If Jim walks at a rate of 4 miles per hour and rides at 42 miles per​ hour, find the amount of time he spent on the bicycle.
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<pre>
              SPEEDS         TIMES     DISTANCES

Bicycling        42           x         42x

Walking          4           7-x       4(7-x)


Total                         7          237
</pre>

{{{42x+4(7-x)=237}}}