Blake has entered a mountain bike competition at starvation flats bike park. placement in the competition is determined by a person's average speed over four laps around the course. the course itself is of a mile long. if blake completed the four laps in 12 minutes, then his average speed around the track is
miles per hour.

step-by-step explanation:

in the absence of parentheses, i will have to make some assumptions:   i interpret your (3x+5/y^6)(4y^3/5)​ to mean:

3x + 5     4y^(3/5)       (3x + 5)(4)

* =

    y^6             1               y^(6-3/5)

if this is not what you expected, repost your question using parentheses to indicate whether you meant

4y^3

    or   4y^(3/5)

    5