Answer:
average speed = 53.1818181818
Step-by-step explanation:
The journey from Boston to New York and New York to Boston covers the same distance. Therefore let the distance be x.
Boston to New York
speed = distance / time
45 = x/time
time = x/45
New York to Boston
speed = distance / time
time = x/65
total time for the journey = x/45 + x/65 = (13x + 9x)/585 = 22x/585
total distance = 2x
average speed = total distance/total time
average speed = 2x × 585/22x
average speed = 585/11
average speed = 53.1818181818
