The first paver paves pavement for 27 hours. Second for 27 hours. I started the first paver and, after 4 hours, joined the second. How long will they finish the pavement?

Correct answer:

x =  15.5

Step-by-step explanation:

4271+(x4)(271+271)=1  x=4+27+2727(274)=15.5

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