Question 839011
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Hi,
Assuming you can walk at 4 mph 0r (1/15)mpm and run at 8 mph 0r (2/15)mpm
Let {{{highlight_green(x)}}} represent how much time can you afford to walk
D = rt  
Question states: you are one mile from the station
{{{(1/15)mpm*x + (2/15)mpm*(11-x) = 1mi}}}  ||Multiplying thru by 15  so as all denominators = 1
{{{(1)mpm*x + (2)mpm*(11-x) = 15mi}}}
       x = 7 minutes, time can you afford to walk
CHECKING our answer***
{{{ 7/15 + 8/15  = 15/15 = 1mi}}}
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