Question 804615
total time = 6 hours . total distance = 311 miles

let Carlos drive for x miles

Maria drives for 311-x miles


Carlos --speed = 53 mph: Carlos time = x/53

Maris speed = 53 mph: Maria time = (311-x)/51

Carlos time + Maria time = 6 hours

x/53 + (311-x)/51 =6

51x+53(311-x)= 6*51*53

51x+16483-53x=16218

-2x=-265
/-2
x=137.5 miles------ distance driven by Carlos