Question

Cindy can type 60 words per minute. She took 3 hours to type a certain document. Bob can type 20 words per minute. How long will he take to type the same document?

Answer 1

I think it will take four hours

Answer 2

Cindy

60 x 60 = 3600 (Amount of words typed per hour)

3600 x 3 = 10800 (Amount of words typed for 3 hours)

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Bob

20 x 60 = 1200 (Amount of words typed per hour)

10800 ÷ 1200 = 9 (Number of hours needed to finish the essay)

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So your answer is 9

Hope this helped. Have a great day!