Here's the intruction
The mutator for
speedInKperHour will check its parameter and use the parameter only if it is not a
negative number.
The mutator for driverStanding takes no parameters. It checks the
speed – if speed is 60 or less, standing will be “no ticket”, if speed is 80 or less,
standing will be “small ticket” and if speed is more than 80, the standing will be “big
ticket”.
Sorry
I'm not really sure what Mutator to use for these two