Treatment 46571

They have 3 sprayers for the chemical treatment of the vines. The first would spray the vineyard in 12 hours, the second in 15 hours, and the third in 10 hours. How long would it take to spray the vineyard with all the sprayers combined?

Correct answer:

t =  4 h

Step-by-step explanation:

t1=12 h t2=15 h t3=10 h  h=1/t1+1/t2+1/t3=1/12+1/15+1/10=41=0.25  t=1/h=1/0.25=4 h



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