Question 1205689
distance from A to B is 175 miles.
distance from B to C is 130 miles.


distance from A to C is 175 + 130 = 305 miles.


rate * time = distance.


from A to B, the rate is 50 miles per hour, so you get 50 * time = 175.
solve for time to get time = 175 / 50 = 3.5 hours.


from B to C, the rate is 65 miles per hour, so you get 65 * time = 130.
solve for time to get time = 130 / 65 = 2 hours.


total time from A to C is 5.5 hours.
total distance is 305 miles.
rate * time = distance becomes rate * 5.5 = 305.
solve for rate to get rate = 305 / 5.5 = 55.454545..... miles per hour.


that's the average speed for the whole trip from A to C.


as a fraction, that becomes 610/11 miles per hour which is equivalent to 55 and  5/11 miles per hour.


round 55.454545..... as required for your answer if fractional answers are not considered.