In a remote-controlled car racing event, car X finishes the track in 60 seconds, while car Y takes 40 seconds to complete the same distance. After starting simultaneously, how many seconds will it take for them to be side by side again?

Answer Choices

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100

120

Correct

180

200

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Explanation

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Official Explanation

Official

To find the time in seconds when both cars will be side by side again, we need to calculate the least common multiple (LCM) of their completion times, which are 60…

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Comments

ChiragJan 25, 2024

Great question!

SaeedAug 26, 2024

thanks for the answer

LetíciaJan 24

It is not given that the race track is circular or continuous. I imagined the race track to be straight.

What this question tests

What it tests

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

Common trap

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