If Juan takes 11 seconds to run y yards, how many seconds will it take him to run x yards at the same rate?

Correct answer marked below

11x/y

Correct

11y/x

x/(11y)

11/(xy)

xy/11

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What this question tests

Your application of distance = rate × time to trains, boats, and commuters, including relative speed.

Mixing units (miles per hour vs. minutes) or averaging speeds — average speed is total distance over total time.