Juan is a gold medalist in athletics. In the month of May, if Juan takes 13 seconds to run y yards, how many seconds will it take him to run x yards at the same rate?
Choices.
A) 10x/y B) 11x/y C) 9x/y D) 12x/y E) 13x/y
velocity=distance/time;   since he ran at same rate both d tyms,   y/13=x/t   so t=13x/y   ANSW13x/yR:13x/y
<result>E</result>
Juan is a gold medalist in athletics. In the month of May, if Juan takes 13 seconds to run y yards, how many seconds will it take him to run x yards at the same rate?