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Mishra takes twice as much time as Dinesh or thrice as much time as Umesh to finish a piece of work. Working together, they can finish the work in 2 days, Dinesh can do the work alone in :
6 hrs
12 hrs
18 hrs
20 hrs
Suppose Mishra, Dinesh and Umesh take x,x/2 and x/3 hours respectively to finish the work. Then, (1/x+2/x+3/x) = 1/2 => 6/x=1/2 => x = 12. So, Dinesh takes 6 hours to finish the work.
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