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Quiz: Time and Work

5 questionsNo time limitPass: 60%+10 XP on first pass

Stop fighting fractions. Take total work as the LCM of the days and every time-and-work or pipes question becomes simple whole-number maths.

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  1. Question 1

    A can do a job in 20 days and B in 30 days. In how many days can they finish it together?

  2. Question 2

    A and B together take 10 days; B alone takes 15 days. How long does A alone take?

  3. Question 3

    8 men can finish a job in 15 days. In how many days can 12 men finish it?

  4. Question 4

    Pipe A fills a tank in 4 hours and pipe B empties it in 6 hours. If both are opened, how long to fill the tank?

  5. Question 5

    A is twice as efficient as B. Together they finish a job in 14 days. How long would A take alone?