Name the people A, B, C, D, and E. Only A and B know how to
drive. First put A in the driver seat, and you have 4 other people
for 4 other seats. Those 4 people can arrange themselves in 4 * 3
* 2 = 24 different ways. If you put B in the driver seat, then the
4 people left can again arrange themselves in 24 different ways.
That makes 24 + 24 = 48 (D) different ways these 5 people can arrange themselves.