Verified Answer :

BeautifulBooks123

The answer is B: 1 1/2 kilometers per minute
In order to solve this equation you have to make the numbers into a ratio: 1/2:20. Then you have to multiply 20 seconds by 3 to get 60 seconds which is equal a minute. Whatever you do to one side of the ratio you have to do to the other, so you have to multiply 1/2 by 3 as well. In the end you will get the ratio 1 1/2 kilometers: 60 seconds (1 minute). 

Hello.

Well one half of a kilometer is 0.5 km. To find the speed in km per minute, find 60 ÷ 20 (since 60 seconds = 1 minute). So 60 divided by 20 = 3. 
So all you have to do next is multiply 0.5 by 3, and the answer is 1.5. 
1.5 is equal to B) 1 1/2. 

Have a good day :)

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