Hi reto,

This question is based around "unit conversions" (the math that is required to convert one unit to another). You'll be asked to perform a few unit conversions on Test Day and they're normally pretty standard (dollars to cents, minutes to seconds, etc.). To answer this question, you need to know that 100 centimeters = 1 meter (the GMAT would normally provide this information in the prompt, since some Test Takers do not know the Metric system of measurements).

So we have to convert 60cm in 1.2 seconds into the equivalent in the correct answer. We can do this math "in pieces"

60cm / 1.2 seconds

First, let's multiply by 5 to get rid of the decimal...

300cm / 6 seconds

Next, divide by 6....

50cm / 1 second

Now we can use the answer choices to our advantage (most of them are "per second"; one is "per minute", but is clearly too BIG, so we can ignore it).

50cm = 1/2 a meter so....

.5m / 1 second

Final Answer:

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Rich

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