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Tom Cogwagee Longboat, of the Six Nations of the Grand River, is one of Ontario’s best known distance runners. In 1907, he set a new Boston Marathon record, beating all of the previous decade’s champions by almost 5 minutes! If he ran the 39.2 km course in 2 hours, 24 minutes and 24 seconds, what was his speed? HINT: we’ll need our units to be metres per second - what do you need to convert in the question?A. 0.221 m/sB. 0.272 m/sC. 4.52 m/sD. 17.5 m/s

Sagot :

Given that the distance is d = 39.2 km.

As 1 km = 1000 m, so d =39200 m

The time taken is t = 2 hours 24 minutes and 24 seconds

As 1 minute = 60 seconds and 1 hour = 60 minutes.

So the time will be

[tex]\begin{gathered} t\text{ = (2}\times60\times60)+(24\times60)+24\text{ seconds} \\ =7200+1440+24 \\ =8664\text{ s} \end{gathered}[/tex]

The speed can be calculated by the formula

[tex]\begin{gathered} v=\frac{d}{t} \\ =\frac{39200}{8664} \\ =4.52\text{ m/s} \end{gathered}[/tex]

The speed is 4.52 m/s

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