Multiple choice

Consider three friends A, B and C who work at differing speeds. When the slowest two work together they take n days to finish a task. When the quickest two work together they take m days to finish a task. One of them, if he worked alone would take thrice as much time as it would take when all three work together. How much time would it take if all three worked together?

  1. 2mn/(m+n)

  2. 3mn/2(m+n)

  3. 4mn/3(m+n)

  4. 2mn/3(m+n)
Reveal answer Fill a bubble to check yourself
C Correct answer

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