Question 984940


First,  let us answer the third question:

>>> C. What is the total distance traveled by the train if the trip took &nbsp;5&nbsp; hours? <<<


Let &nbsp;<B>L</B>&nbsp; be the total distance. &nbsp;Then you have the equation based on given data 


{{{L/40}}} + {{{L/60}}} = {{{5}}}.


Solve it by simplifying step by step:


{{{3L/120}}} + {{{2L/120}}} = {{{5}}},


3L + 2L = 5*120,


5L = 5*120,


L = 120.


So, &nbsp;the total distance is &nbsp;120 miles.


Now, we can answer the second question:
>>> B. What is the average speed for the round trip? <<<


The round trip was &nbsp;120 = 120 = 240 miles, &nbsp;and it took 5 hours.

Hence, &nbsp;the average speed for the round trip is &nbsp;{{{240/5}}} = 48 miles.


Finally, &nbsp;the average velocity is &nbsp;0, &nbsp;since the the locomotive returned back to the starting point and the displacement is zero after &nbsp;5 hours.


That is all.