Casey and Mark Are Running a Race at Constant Speeds

question 64

Multiple Choice

Casey and Mark are running a race at constant speeds. The graph below shows the distance d (in miles) they have traveled since they started the race at time t (in minutes) . Which one of the following statements is true?

• A) Not enough information
• B) Mark is running faster than Casey.
• C) Casey is running at 0.23 mph, while Mark is running at 0.31 mph.
• D) Casey is running at 4.3 mph, while Mark is running at 3.2 mph.
• E) Casey and Mark are both traveling at the same constant speed.