Hi,

If Sam is takes a typing test that lasted 15 minutes and typed 84 wpm, what was his total words typed?  84•15 = 1260 words. 

Oral test involved typing at 72wpmin (how much time did that take?

        | Cross Multiplying to solve

   x = 12.9 min  (rounded to nearest tenth)

Total test 15min + 12.9min = 27.9min 

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