Mobius is the fastest mule in Italy.  She can run at a top speed of 13 miles per hour when she is without any load to carry, and she can travel at 11 miles per hour as her top speed when she carries a typical load.  If she travels the 143 miles from Florence, Italy to Rome, Italy at top speed while carrying a typical load, then returns to Florence at her usual top speed without carrying a load, how long, in hours, will the trip take if she takes two 30-minute rest stops during each half of the trip?
How many minutes are in a half hour? ** 30 minutes is 30/60=<<30/60=0.5>>0.5 hours.
How many minutes are in each rest stop? ** Two 30-minute rest stops take 0.5*2-1 hour.
How many hours are in each rest stop? ** If she takes two rest stops per each half of the journey, then she takes 2*1=<<2*1=2>>2 hours in rest time.
How many hours does it take her to travel 143 miles? ** With a load, at her top speed, she can travel 143 miles in 143/11=<<143/11=13>>13 hours.
How many hours does it take her to travel 143 miles without a load? ** Without a load, at her top speed, she can travel 143 miles in 143/13=<<143/13=11>>11 hours.
How many hours will the round trip take? ** Thus, the round trip will take 13+11+2=<<13+11+2=26>>26 hours.
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