Question 1164937
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The rate bicycling is 4 times the rate walking.

Since the distance is the same, it means that the time walking is 4 times time bicycling.


So, if x is the time bicycling, then the time walking is 4x.


From the condition, you have this equation

    4x - x = 2.5 hours,

or

    3x = 2.5 hours


Hence, the time bicycling is  x = {{{2.5/3}}} hours.


It implies that the time for the entire two ways journey is

    x + 4x = 5x = {{{5*(2.5/3)}}} = {{{12.5/3}}} hours = 4 hours and 10 minutes.


<U>ANSWER</U>.  The entire journey takes  4 hours and 10 minutes.
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Solved.