Journey

Charles and Eva stands in front of his house, Charles went to school south at speed 5.4 km/h, Eva went to the store on a bicycle eastwards at speed 21.6 km/h. How far apart they are after 10 minutes?

Correct result:

x =  3.7108 km

Solution:

$x=(10\mathrm{/}60)\cdot \sqrt{5.4^2+21.6^2}=3.7108\text{ km}$

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