6. A sprinter running 100m in 15 seconds. Calculate the speed. A. 66.67 m/sB. 67.67 m/sC. 6.66 m/sD. 115 m/s7. Calculate the speed of a car running 72 meters after 9 seconds.A. 9 m/sB. 8 m/sC. 7 m/sD. 2 m/s8. Find the velocity of a train that traveled...