Construction 71794

Two different trucks together would bring the construction material in 6 hours. However, after 4 hours, the first car was transferred to another job, and the second one was driven for another 6 hours. How many hours would it take for the first car to deliver the material? How many for the second?

Correct answer:

a =  9 d
b =  18 d

Step-by-step explanation:

1/a+1/b = 1/6 4/a + (4+6)/b = 1  b = (6 a)/(a  6) 4/a + 10  (a6)/(6a) = 1  4+10 (a6)/6=a  4a=36  a=436=9  a=9=9 d
b=(6 a)/(a6)=(6 9)/(96)=18 d



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