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Luke swam the first 300 meters at a rate of 30 meters per minute. He then relaxed and swam the last 200 meters at a rate of 25 meters per minute. How long did it take Luke to swim all 500 meters?
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distance (d) = speed(v) times time(t) 300 = 30 t_1 200 = 25 t_2 total time = t_1 + t_2
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