Multiple choice

X and Y can do a job alone in 10 days and 12 days, respectively. X starts the work and after 5 days, Y also joins to finish the work together. For how many days did Y actually work on the job?

  1. 30/13

  2. 30/11

  3. 11/13

  4. 31/13

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Work done by X in 5 days = 5*1/10 = 1/2 Balance work to be done = 1 - 1/2 = 1/2 (X + Y) 's one day's work = 1/10 + 1/12 = 11/60 Number of days Y worked = 1/2 * 60/11 = 30/11 So, option (2) is correct.

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