Tom swims for 2 hours at a speed of 2 miles per hour.  He then runs for half the time at 4 times the speed.  How many miles did he cover?
He swam 2*2=<T>multiply(2, 2)=4 miles
He ran for 2/2=<T>divide(2, 2)=1.0 hour
His running speed was 2*4=<T>multiply(2, 4)=8 mph
So he ran 8*1=<T>multiply(8, 1)=8 miles
So his total distance was 8+4=<T>add(8, 4)=12 miles
