Mathematics
Grade10
Easy

Question

Kenji can finish a puzzle in 2 hours working alone. Oscar can finish the same puzzle in 3 hours working alone. How long would it take Oscar and Kenji to finish the puzzle if they worked on it together?

  1. 1 hour
  2. 70 minutes
  3. 1.5 hours
  4. 72 minutes

hintHint:

Time And Work Work is defined as something which has an effect or outcome; often the one desired or expected. 

The correct answer is: 72 minutes


    Step 1 of 1:
    Kenji: 1 puzzle in 2 hours
    1 half of a puzzle in 1 hour
    Oscar: 1 puzzle in 3 hours
    1 third of a puzzle in 1 hour
    Working together, they can finish open parentheses 1 half plus 1 third close parentheses of a puzzle in 1 hour.
    1 half plus 1 third equals 5 over 6 text end text of a puzzle in 1 hour
    That means: 1 puzzle in 6 over 5 hours
    72 minutes.

    For solving time and work problem, we generally use unitary method

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