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The first tiler would tile the pool inside in 5 working hours; the second would need 7 working hours for the same job. How long would it take them to tile the pool inside together if the second tiler starts working on the pool 12 minutes later than the first?

Correct answer:

t =  3 h

Step-by-step explanation:

t1=5 h t2=7 h t3=6012=51=0.2 h  t/t1+(tt3)/t2=1 t/5+(t0.2)/7=1  12t=36  t=1236=3  t=3=3 h



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