A contractor finds that it takes sam tockett 10 hours to construct a wall of a certain size. it takes jim lowell 7 hours to construct the same wall. how long would it take if they worked together?

Marty is helping make floral centerpieces for the sports banquet.
The guidelines tell him how many of each flower to use in one centerpiece.

If he follows the guidelines, which statement is true?

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CLEAR CHECK

The ratio of lilies to carnations is 3 to 2.

The ratio of carnations to daffodils is 2 to 3.

For 12 centerpieces, he will need 36 carnations.

For 24 centerpieces, he will need 36 lilies.

Answer Link

abidemiokin abidemiokin · Answer 2 · 2021-12-10T12:17:49+01:00

The time it will take them to worked together is 4.12 hours

The time it takes sam to construct a wall is 10 hours

The time it takes Jowell to construct a wall is 7 hours

The time it will take both of them to work will be derived by taking the sum of the reciprocal of the time it will take individual times as shown;

Let "t" be the needed time it takes them to work together, to get the value of "t"

1/t = 1/10 + 1/7

1/t = 7+10/70

1/t = 17/70

t = 70/17

t = 4.12 hours

Hence the time it will take them to worked together is 4.12 hours

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