Two road crews, working together, repaired 1 mile of road in 4 hours. working separately, one of the crews takes about 6 hours to repair a similar road. how much time would the other crew, working alone, need to repair a similar road?

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Ответ:

khambay

02.06.2021

Mathematics

Apply the general formula to solve

$ar = 9 \\ a {r}^{3} = 81 \\ \frac{{ar}^{3} }{ar} = \frac{81}{9} \\ {r}^{2} = 9 \\ r = 3 \: \\ therefore \: a = 3$

Then, use the sum formula

$\frac{a( {r}^{n} - 1) }{r - n} \\ \frac{3( {3}^{5} - 1)}{3 - 1} = 363$

Hope this helps!

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