A racecar races on a circular race track. Calculate the average racing speed given that distance around the track is 2500 m and the racecar does it in 40 seconds.

Hi, your answer is not correct. this is a cumulative  

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

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