Question 291184
  Speed = 80 mph  (miles per hour)

  Time = {{{3&3/4}}} hours. (3 hours 45 mins)

  Distance = ????   (Here use this formula)

  Distance = Speed x Time

           = 80 x {{{3&3/4}}}

           = 80 x {{{15/4}}}

           = {{{cross(80)}}} x {{{15/cross(4)}}}

           = 20 x 15  =  300 miles.

I think you have understood this.  God bless you.  

gsm