Xavier runs 21 miles in three hours what is his unit rate for the average distance he ran after one hour

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Parks is wearing several rubber bracelets one third of the bracelets are tie dye 1/6 are blue and 1/3 of the remainder are camouflage if park swears to camouflage bracelets how many bracelets does he have on

When you answer this can you explain