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Chemistry, 20.09.2020 15:01 100011

A world class marathoner runs at 11.5 mph (miles per hour). Is this greater than 20 km/h?

1.000 km = 0.6214 mi

-11.5 mph is equivalent to 7.15 km/h, so it is NOT greater than 20
-11.5 mph is equivalent to 23.0 km/h, so this is greater than 20
-11.5 mph is equivalent to 18.5 km/h- therefore it is NOT greater than 20
-11.5 mph is exactly equal to 20.0 km/h

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A world class marathoner runs at 11.5 mph (miles per hour). Is this greater than 20 km/h?
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