14 hours
Explanation:Trip from A to C:
Total distance from A to C = 175 miles
Speed from A to B = 13 miles per hour
Speed from B to C = 12 miles per hour
Speed = distance/time
distance = speed × time
distance From A to B + distance from B to C = Distance from A to C
Since the time for both distance is the same, let time = t
13 × t + 12 × t = 175
13t + 12t = 175
25t = 175
divide both sides by 25:
25t/25 = 175/25
t = 7
Each trip took 7 hours
The entire trip took = 7 hours from A to + 7 hours from B to C
The entire trip took = 7 + 7 = 14 hours
