Work together

Two bricklayers plastering a wall. The first would plaster it in 8 hours, the second in 12 hours. How many hours will they be done with the work if they work together?

Correct result:

s =  4.8 h


t1=8 h t2=12 h    s (1/t1+1/t2)=1 s (1/8+1/12)=1  5s=24  s=245=4.8=245 h=4.8 h

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