What you have to do to get to this answer is to use the formula for the circumference of a circle. Once you have that, you need to know what percent of the circumference of the wheel is represented by 2 feet. Given that, you then need to multiply that percent by the number of degrees in a circle. Here are the steps:
The circumference of a circle is equal to pi times the diameter. Since the radius is .5 of the diameter, the radius here is 28 inches.
28*3.14 = 87.92.
Now divide 24 inches (2 feet) by this circumference.
24/87.92 = .27
So 2 feet is .27 of the circumference.
There are 360 degrees in a circle.
360*.27 = 98.2