# A truck

A truck departs from a distribution center. From there, it goes 20km west, 30km north and 10km west and reaches a shop. How can the truck reach back to the distribution center from the shop (what is the shortest path)?

Correct result:

s =  42.426 km

#### Solution:

$x=20 + 10=30 \ \text{km} \ \\ y=30 \ \text{km} \ \\ \ \\ s=\sqrt{ x^2+y^2 }=\sqrt{ 30^2+30^2 }=30 \ \sqrt{ 2 }=42.426 \ \text{km}$

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