Each person should ride the bike for 4 miles, so that every one has to walk 8 miles and ride 4 miles.
If they had 2 bikes, each person will ride for 8 miles, 4 miles on each bike, and then walk 4 miles.
Radius into radius .You should know half of diameter is radius.
Start by dividing both sides by two to get 3 = y + 2. then subtract two from both sides to get y = 1.
