Asprinter set a high school record in track and field, running 200.0 m in 21.8 s . what is the average speed of the sprinter in kilometers per hour? express your answer numerically in kilometers per hour.

The answer is 33.012 km per hour. You will use the formula speed= distance divided by time.
speed= 200m  / 21.8 sec
speed= 9.17 m/sec
in order to convert it by km per hour, you will just need to convert meter to km and seconds to hour by:
9.17 m/sec (1 km/ 1000 meters) (60 seconds/ 1 minute) (60 minutes/ 1 hour) = 33.012 km/hour

C. -12, -2, 4, 10