Answer:
Speeds of car 1 and car 4 are same.
Explanation:
Speed of an object =
For car 1,
Speed of car 1 =
= 70 miles per hour
For car 2,
Speed of car 2 =
= 60 miles per hour
For car 3,
Speed of car 3 =
= 64 miles per hour
For car 4,
Speed of car 4 =
= 70 miles per hour
Therefore, speeds of car 1 and car 4 are same.