Bicycle Wheel
When he discovers that her bicycle is too big, Stacy’s dad decides to buy his daughter a new, smaller bike. The diameter of the big wheel is 20 inches, which makes the radius 10 inches. ... The training wheel that tails behind the large wheel is 5 inches, or ¼ the size of the big wheel. The problem does not give us a rate for the small wheel, but we can assume that if it is ¼ the size, then it must take ¼ the amount of time to revolve once. ... In the situation, Stacy runs over a paint spot at t= 0 and we are asked to find out when the big wheel and the training wheel are at the same height above the pavement at the same time.