Bricklayer student wall

A bricklayer can repair a wall by himself in 30 minutes. His students would take an hour. How long will it take them working together?

Final Answer:

t =  20 min

Step-by-step explanation:

t1=30 min t2=1 h min=1 60  min=60 min  t (1/t1+1/t2)=1 t (1/30+1/60)=1  3t=60  t=360=20  t=20=20 min



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