A college language class was chosen for an experiment in learning. Using a list of 50 words, the experiment involved measuring the rate of vocabulary memorization at different times during a continuous 5-hour study session. It was found that the average rate of learning for the entire class was inversely proportional to the time spent studying and was given approximately by

If the average number of words memorized after 1 hour of study was 15 words, what was the average number of words memorized after t hours of study for 1 ‰¤ t ‰¤ 5? After 4 hours of study? Round answer to the nearest whole number.

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15 V'(t) = t