Raj and Ram working together do a piece of work in 10 days. Raj alone can do it in 12 days. Ram alone will do the work in :

Raj and Ram working together do a piece of work in 10 days. Raj alone can do it in 12 days. Ram alone will do the work in :
[A]20 days
[B]40 days
[C]50 days
[D]60 days

60 days
(Raj + Ram)’s 1 day’s work = \frac{1}{10}
Raj’s 1 day’s work = \frac{1}{12}
∴ Ram’s 1 day’s work =\frac{1}{10}-\frac{1}{12} = \frac{6-5}{60} = \frac{1}{60}
∴ Required Time = 60 days.
Hence option [D] is correct answer.

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