Another vector question

A child walks due east on the deck of a ship at 1 miles per hour.
The ship is moving north at a speed of 1 miles per hour.

Find the speed and direction of the child relative to the surface of the water.

speed = sqrt(2)

im having trouble finding the direction

The angle of the direction from the north = _____ (radians)

$$V_c = <1,0>$$
$$V_s = <0,1>$$
$$V= <0,V>$$

im not sure how i can find the direction

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