Question 165248
The total distance is 25. The total time is 2 hours. 
The total distance is the sum of the DistanceByCycle + DistanceWalking
Let C be the time on the cycle.
Then the time walking, W, is given by {{{TotalTime - C}}} = {{{2 - C}}}


{{{DistanceByCycle = SpeedByCycle * C }}}
{{{DistanceByCycle = 45 * C}}}

{{{DistanceWalking = SpeedWalking * TimeWalking}}}
{{{DistanceWalking = 6 * (2 - C) }}}

Finally {{{TotalDistance = DistanceByCycle + DistanceWalking}}}
{{{25 = (45 * C) + ( 6 * (2 - C)) }}}
{{{25 = 45C + 12 - 6C }}}
{{{13 = 39C}}}
{{{1/3 = C}}}}

So you took the cycle 1/3 of an hour (20 minutes and then walked for 5/3 hours (100minutes)

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For what it is worth, walking at 6mph is really hoofing it