In racing over a given distance d at uniform speed, A can beat B by 10 meters, B can beat C by 4 meters, and A can beat C by 12 meters. What is the distance d in meters?  Choose the correct choice from the following choices
A) 16 B) 20 C) 30 D) 40 E) 50
When A is at the finish line, B is 10 meters back, and C is 12 meters back.   When B runs another 10 meters to the finish line, C is 4 meters back.   So B gains 2 meters every 10 meters covered.   To gain a final difference of 4 meters, B runs a total of 20 meters.   The answer is 20.
<result>B</result>
In racing over a given distance d at uniform speed, A can beat B by 10 meters, B can beat C by 4 meters, and A can beat C by 12 meters. What is the distance d in meters?