Create a program that checks whether a car exceeds a speed limit.
Write a function checkSpeed() that will take two arguments: speed and limit. By default the limit is 60 kilometers per hour.
The speed contains the actual speed of the car. The limit contains the limit on the road. If there is no special restriction, you must apply the default limit.
Output Exceeds the limit by N kilometers per hour where N is kilometers per hour above the limit. If everything's OK, output Within the limit.