1961 AHSME Problems/Problem 37

In racing over a given distance $d$ at uniform speed, $A$ can beat $B$ by 20 yards, $B$ can beat $C$ by 10 yards, and $A$ can beat $C$ by 28 yards. Then $d$, in yards, equals:


$\textbf{(A)}\ \textrm{not determined by the given information} \qquad \textbf{(B)}\ 58 \qquad \textbf{(C)}\ 100 \qquad \textbf{(D)}\ 116 \qquad \textbf{(E)}\ 120$ The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. AMC logo.png