Travelling at an average speed of 580 ms how long would it t

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?

Solution

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.