alan drives his shiny, new car around a racertack everyday. the race track has a diameter of 60 meters/ one day he manages to go all the way around the track in 12pi seconds. what is his average speed in meters per second?

Question

alan drives his shiny, new car around a racertack everyday. the race track has a diameter of 60 meters/ one day he manages to go all the way around the track  in 12pi seconds. what is his average speed in meters per second?

anonymous · Answer

circumference of the race track is required. is the race track a circle?

anonymous · Answer

it doesn't say but I would think yes because it gives diameter

anonymous · Answer

I also think so

so whats the circumference of a circle ?

anonymous · Answer

2pir

anonymous · Answer

so the meters he makes when going one round is

round = pi * 60m

anonymous · Answer

he makes the round in 12pi seconds, so:
$$v = \frac{ \pi \times 60m }{ 12\pi s}$$

anonymous · Answer

so do i leave it like that or simplify?

anonymous · Answer

$$\frac{ 5m }{ s} $$ ?

anonymous · Answer

yes I would get v= 5 m/s

anonymous · Answer

ok thanks