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Q 2205856768.     Mohan and Sohan working separately can dig a trench in
10 days and 12 days respectively. If they work for 1 day
alternately, Mohan beginning, in how many days will the
trench be dug?
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)