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**1. Homework Statement**

A car is moving toward north with a speed of 35 km/h. A truck travels toward west with a speed of 42 km/h.

Which is the speed of the caravan according to the car's driver?

**2. Homework Equations**

**3. The Attempt at a Solution**

The solution given by the book is 15 m/s with direction south-west, but I get the solution of 15 m/s with direction north-west and I cannot get the reason.

Can you help me with this?

Thanks