Antonio is on the track team. He ran the 400-meter dash in 1 minute and 20 seconds. The graph shows his performance on the 400-meter hurdles. How much faster was his average speed in the 400-meter dash?

Answer:
5/3 m/s
Step-by-step explanation:
Antonio's speed in the 400 m dash was ...
(400 m)/(80 s) = 5 m/s
Antonio's speed in the hurdles was ...
(400 m)/(120 s) = 3 1/3 m/s
His speed in the dash was ...
(5 -3 1/3) m/s = 1 2/3 m/s = 5/3 m/s
faster than in the hurdles.