A 1,542kg car traveling to the right and collides elastically with a second car of 1,250kg mass that is moving to the left at 27 m/s. What is the speed of the first car before and after the collision?

a) Before: Unknown; After: Unknown
b) Before: 13 m/s; After: 27 m/s
c) Before: 27 m/s; After: 13 m/s
d) Before: 27 m/s; After: 27 m/s