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In school mechanics it does not. The force acting on the car is directly proportional to its mass (its weight adjusted for the incline of the ramp). The acceleration of the car is inversely proportional to this force. The overall result is that the mass of the car does not affect its motion. In more advanced mechanics, where friction and drag are taken into account, things start getting more complicated.
18 feet
The length of the downward sloping side of the ramp would be 18 feet approximately this is pythagarus theorem of the sum of squares. the answer should in fact be the number corresponding to the square root of (10*10+15*15).
It should be like 25 feet long and put at a like 45 degrees angle