Whether the car slows down or speeds up depends on the direction of the force applied, because if Gordon applied the force opposite the direction of the cart's movement, then the cart will slow down. If however, the force is applied in the direction of the carts movement, then the cart will speed up.
3/5 is 0.6 7/8 is 0.875 0.6/0.875 is 0.685714286 0.685714286 is 685714286/1000000000 (not so sure about it but that was what i came up with hope i helped)
