Question

Will MARK BRAINLYEST

Answer 1

Answer:

It will take 3.6 hours to wax a car if they work together.

Step-by-step explanation:

Calvin one hour work = $\frac{1}{3}$

Alvin one hour work = $\frac{1}{5}$

To find out how much they can do together per hour,

We have to add $\frac{1}{3}$ and $\frac{1}{5}$

= $\frac{1}{3} + \frac{1}{5} = \frac{(5 + 3)}{15}$

= $\frac{8}{15}$  --------------(1)

They can do $\frac{8}{15}$ of the job per hour.

If "t" is the time taken to finish the  job together, then one hour work

$\frac{1}{t}$ ------------------------(2)

Now we have to find the value of "t" by setting the expression (1) and (2) equal.

$\frac{8}{15} = \frac{1}{t}$

It can solve by flipping the equation;

$\frac{t}{1} = \frac{18}{5}$

t = 3.6 hours

It will take 3.6 hours to wax a car if they work together.

Answer 2

I believe its 4 hours because 3+5=8
8/2=4