Can you provide an in-depth solution for: Pete walks backwards three times faster than Susan walks forwards, and Tracy does one-handed cartwheels twice as fast as Susan walks forwards.  But Pete can walk on his hands only one quarter the speed that Tracy can do cartwheels.  If Pete walks on his hands at 2 miles per hour, how fast can Pete walk backwards, in miles per hour?Hey there, could you help me solve this math problem: Pete walks backwards three times faster than Susan walks forwards, and Tracy does one-handed cartwheels twice as fast as Susan walks forwards.  But Pete can walk on his hands only one quarter the speed that Tracy can do cartwheels.  If Pete walks on his hands at 2 miles per hour, how fast can Pete walk backwards, in miles per hour?