Aditya, Vedus and Yuvraj alone can do a job in 6 weeks, 9 weeks and 12 weeks respectively. They work together for 2 weeks. Then Aditya leaves the job. Vedus leaves the job a week earlier to the completion of the work. The job would be completed in:
Explanation:
Aditya, Vedus and Yuvraj do (1/6), (1/9) and (1/12) of the work respectively in a week. Let the total time taken to complete the work be n weeks.
Then,
216 + (n - 1)19 + n112 = 1
∴ 12+4(n-1)+3n36 = 1
∴ n = 4
Hence, option (a).
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