###Human: Four runners ran a combined total of 195 miles last week. Katarina ran 51 miles. Tomas, Tyler, and Harriet all ran the same distance. How many miles did Harriet run?, ### Assistant: 195 - 51 = 144 = miles the 3 runners ran
144/3 = 48 miles
Harriet ran 48 miles. 
 So the answer is :  48