Bricklayer 65064

The bricklayer would be able to repair the wall himself in 30 minutes. It would take students an hour to learn. How long will it take for them to work together?

Correct 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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