Answer:
x = 13
Explanation:
x= Esmeralda's speed
x+5 = Diana's speed
they each travel for 6 hours
speed x time = distance
x(6) + (x+5)(6) = 186
Esmeralda's distance + Diana's distance = total distance
6x+6x+30= 186
(12x = 186-30)
12x = 156
x = 13
Esmeralda travels at 13 mph and Diana travels at 18 mph
(To be completely honest, I'm not sure. I'm not in college so you shouldn't use my answer as a first resort :') )