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 =  42.4264 km


x=20+10=30 km y=30 km  s=x2+y2=302+302=30 2=42.4264 km

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