John trains for ultramarathons.  He starts only able to run 8 hours straight but eventually increases that by 75%.  He also increases his speed of 8 mph by 4 mph.  How far can he run now?
He increases the time he can run by 8*.75=<T>multiply(8, 0.75)=6.0 hours
So he can now run 8+6=<T>add(8, 6)=14 hours
His speed is now 8+4=<T>add(8, 4)=12 mph
So he can run 14*12=<T>multiply(14, 12)=168 miles
