Exam Maths Puzzle Category

A and B can finish a work in 12 days B and C can finish the same work in 20 days .If A,B and C working together for 4 days and after that C left the work .Now how many days A and B will take to finish the work.

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Exam Other Question
1/x+1/y=1/z..where x=12
 Two men,Vikas and Vishal,working separately can mow a field in 8 and 12hours respectively.If they have work in stretches of one hour respectively,Vikas beginning at 8a.m,when will the mowing be finished?