QQuestionMathematics
QuestionMathematics
Hicham El Guerrouj of Morocco holds the world record in the 1500 m running race. He ran the final 400 m in a time of 51.9 s.
What was his average speed in mph over the last 400 m?
over 1 year agoReport content
Answer
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Step 1:Let's solve this step by step:
Step 2:: Convert the given information to standard units
- Distance = 400 m - Time = 51.9 s
Step 3:: Calculate the average speed in meters per second
v = \frac{distance}{time} = \frac{400 \text{ m}}{51.9 \text{ s}} = 7.706 \text{ m/s}
Step 4:: Convert meters per second to miles per hour
7.706 \text{ m/s} \times \frac{3600 \text{ s}}{1 \text{ hr}} \times \frac{1 \text{ mile}}{1609.344 \text{ m}} = 17.22 \text{ mph}
- First, convert meters to miles: - Convert speed:
Step 5:: Round to appropriate significant figures
17.2 \text{ mph}
Final Answer
Hicham El Guerrouj's average speed over the last 400 m was 17.2 mph.
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