Tiana can clear a football field of debris in 3 hours. jacob can clear the same field in 2 hours. if they decide to clear the field together, how long will it take them?

For this case, the first thing we must do is define a variable.

We have then:

t: time it will take Tiana and Jacob to finish the work together.

We have then that the equation that models the problem is given by:

From here, we clear the value of t.

For this, we follow the following steps:

1) Multiply both sides of the equation by 6t:

2) Simplify both sides of the equation:

3) Add similar terms:

4) Clear the value of t.

If they decide to clear the field together they will take them about 6/5 hours

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i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.