:which conversion factors are used to multiply to 12 m/s to get kilometers per minute? select each correct answer. 60 s/1 min 1min/60 s 1 km/1000 m 1000/m1 km

option A and C (km/1000m and 60second/ 1 minute )
In this question, we have two unit that needed to be converted, meter/second into kilometer/minute. 
First, we need to convert meter into the kilometer. One kilometer is equal to 1000 meter. To change meter into the kilometer, the unit used for multiplication should be km/1000m which is option C.
Then we need to convert second into the minute. One minute is equal to 60 seconds. To change "/second" into "/minute" the multiplication unit should be 60second/ 1 minute which was option A

What does h hours mean

The answer is b: step 2.