If ( s )stands for speed and later in the question it says that the car was going 55 miles per hour you will replace the s in the equation with the number 55. 55=4.74d Now you need to find ( d ) If you look at this equation another way you will see that what it’s saying is 4.74 x ? Is 55 Because d replaces the question mark So 55 divided by 4.74 is 11.603 which is the answer