Question 1175428
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Let t be the time bicycling.

Then the time walking was (6-t).


Now you write the total distance equation


    31*t + 5*(6-t) = 121


Simplify and solve


    31t + 30 - 5t = 121

       26t        = 121 - 30 = 91

         t                   = {{{91/26}}} = 3.5.


<U>ANSWER</U>.  3.5 hours bikyng.
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Solved.