(a) While driving a car at \(25 \mathrm{~m} / \mathrm{s}\), you pass a truck traveling in the same direction at \(22 \mathrm{~m} / \mathrm{s}\). If you assign the direction in which the two vehicles are moving as the positive \(x\) direction of a coordinate system, what is the truck's velocity relative to you?

(b) Now a motorcycle passes you at \(29 \mathrm{~m} / \mathrm{s}\). What is its velocity relative to you?