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A river current has a velocity of 5 km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. How can the velocity of the boat relative to the shore be calculated?a. by subtracting the river current vector from the boats velocity vectorb. by dividing the river current by the boats velocity vectorc. by multiplying the vectorsd. by adding the vectors
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