Question

The speed, in miles per hour, at which the car travels a distance of 52 feet during reaction time is closest to which of the following?

• A. 43
• B. 47
• C. 51
• D. 55
• E. 59

Hint:

When solving graph-based problems, always match the given condition (distance or time) on the vertical axis and trace horizontally to intersect with the graph curve. Then read off the corresponding value on the horizontal axis.

Answer 1

The Correct Option is B

Step 1: Recall reaction time relationship.
From the given graph, the distance traveled during reaction time increases linearly with speed. The vertical axis shows distance (feet), and the horizontal axis shows speed (miles per hour).
Step 2: Locate 52 feet on the distance axis.
On the graph, 50 feet corresponds to a speed slightly less than 50 mph. The problem asks for 52 feet, which is slightly above 50 feet on the vertical axis.
Step 3: Find corresponding speed.
Reading horizontally to the curve, the corresponding speed is approximately 47 mph. This is less than 50 mph but more than 45 mph.
Step 4: Conclusion.
Therefore, the speed closest to the required distance of 52 feet is: \[ \boxed{\text{(B) 47}} \]