Question 979940
Let {{{ d }}} = the total distance of the journey in km
From the given data:
{{{ .2d + 36 = d }}}
{{{ .8d = 36 }}}
{{{ d = 36/.8 }}}
{{{ d = 45 }}} km
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{{{ .2d = .2*45 }}}
{{{ .2d = 9 }}} km
For the 1st 20% of trip:
{{{ 9 = 20t }}}
{{{ t = 9/20 }}} 
{{{ t = 27/60 }}} hrs
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For the entire trip:
{{{ 45 = 30*t }}} 
{{{ t = 90/60 }}} hrs
This is just the time spent cycling
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{{{ 90/60 - 27/60 = 63/60 }}}
The time to travel the last 36 km is:
63/60 hrs = 1 hr 3 min
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By my reasoning, the legth of time he
spends stopped is irrelevant. I could
be wrong on that -you should get
another opinion.