In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: bexy walks 5 miles from point a to point b in one hour , then bicycles back to point a along the same route at 15 miles per hour . ben makes the same round trip , but does so at half of bexy ' s average speed . how many minutes does ben spend on his round trip ?
Options: a ) 40 , b ) 80 , c ) 120 , d ) 160 , e ) 180
A:
d