Maria can fill a certain order in 13 hours and Jim needs 15 hours to do the same job. Working together, how long will it take them to fill the order?

7 hours

Step-by-step explanation:

Maria can fill a certain order in 13 hours,

so her working rate is

and Jim needs 15 hours to do the same job, so his working rate is:

Assuming the two will take x hours working together, then

It will take both approximately 7 hour

5050 i think

step-by-step explanation:

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column