Question 938296: Travelling at an average speed of 5.80 m/s, how long would it take to complete the Boston Marathon a distance of 40.0 km? Found 2 solutions by Alan3354, mathmate:Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Travelling at an average speed of 5.80 m/s, how long would it take to complete the Boston Marathon a distance of 40.0 km?
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40 km = 40000 meters
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d = r*t
t = d/r = 40000/5.8
t =~ 6897 seconds
You can put this solution on YOUR website! Key to solving this question is to work with consistent units.
By writing units at every step, we can ensure that units are correct.
Important formula: Distance = speed * time (* is used to mean multiply)
40 km = 5.8 m/s * time
Convert 40 km to metres (1 km = 1000 m)
40000 m = 5.8 m/s * time
Divide by 5.8 m/s on each side and switch sides,
time = 40000/5.8 s
= 6896.6 s
Convert to hours and minutes (1 hour = 60 minutes, 1 minute = 60 seconds)
time = 6896.6 s = 1 hour + 3296.6 s = 1 hour + 54 minutes + 56.6 seconds
Answer: It takes the runner 1h 54m 56.6s to finish the Boston Marathon.
