Question

A marathon runner runs 42 km in 10,800 s. What is the runner's average speed?

a) 0.0039 m/s
b) 3.89 m/s
c) 39 m/s
d) 389 m/s

Answer 1

The marathon runner's average speed is calculated using the formula Speed = Distance / Time. With a distance of 42 km (converted to 42,000 meters) and a time of 10,800 seconds, the average speed is found to be approximately 3.89 m/s.

Step-by-step explanation:

The question asks about calculating the average speed of a marathon runner who runs 42 km in 10,800 seconds. To find the average speed, we use the formula:

Speed = Distance ÷ Time

Substituting the given values, we get:

Speed = 42,000 m ÷ 10,800 s

This calculation results in an average speed of approximately 3.89 m/s, which makes option (b) the correct answer.