Question

Maria takes 2 hours to plant 50 flower bulbs. Lois takes 3 hours to plant 45 flower bulbs. Working together, how long should it take them to plant 150 bulbs?

Answer 1

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Answer 2

Maria: (50 bulbs)/(2 hours) = 25 bulbs/hour

Lois: (45 bulbs)/(3 hours) = 15 bulbs/hour

Together: 25 + 15 = 40 bulbs/hour

(150 bulbs)/(40 bulbs per hour) = 3 3/4 hours

(3/4 hours)(60 minutes/hour) = 45 minutes

Total time: 3 hours 45 minutes