have is 300 kilometers.) For the first d kilometers, Rachel drives at x
kilometers per hour.
Distance equals rate times time, so time equals distance over rate, and
the time for the first leg is hours.
For the next 2d kilometers, Rachel drives at y kilometers per hour, so the
time for the second leg is hours.
8 . D
This is a permutations question with a twist. Think of it as the
arrangement of five items: three distinct people and two
indistinguishable nonpersons.