Well, it depends: If your friend wants something dark-er, than blue, then I would pick purple. While blue can be a sort of brighter color for certain situations.
Syncopation- occurs when a rhythmic pattern that typically occurs on strong beats or strong parts of the beat occurs instead on weak beats or weak parts of the beat.
one rotation is ten seconds and it travels 500 feet
so you would take 500 times 6 because it takes six rotations for one full minute. Now you have 3,000 but it wants to know 2 minuts so the answer is 6,000