K can build a wall in 30 days. L can demolish that wall in 60 days. If K and L work on alternate days, when will the wall be completed ?

K can build a wall in 30 days. L can demolish that wall in 60 days. If

1.	K can build a wall in 30 days. L can demolish that wall in 60 days. If K and L work on alternate days, when will the wall be completed ?
A.	120 days
B.	119 days
C.	118 days
D.	117 days
Answer» E.

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K can build a wall in 30 days. L can demolish that wall in 60 days. If K and L work on alternate days, when will the wall be completed ?

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