Hi,

A person leaves home a 8:00 am and drives to a destination at a rate of 40 miles per hour. 

The person returns at a rate of 25 miles per hour and arrives at 2:30 pm. 

Total time 6.5 hr  (Assuming no stopping time)

D/r  = t

 D/40mph + D/25mph = 6.5

   65D = 6.5(40*25)

     D = 6.5(40*25)/65

     D = 100mi 

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