Hi,

Assuming you can walk at 4 mph 0r (1/15)mpm and run at 8 mph 0r (2/15)mpm

Let  represent how much time can you afford to walk

D = rt  

Question states: you are one mile from the station

  ||Multiplying thru by 15  so as all denominators = 1



       x = 7 minutes, time can you afford to walk

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