The first programmer can write an app in 10 days. the second programmer can finish the same job in 8 days. how long would it take them to finish the job if they were working together?

40/9 days

Step-by-step explanation: let x be the time when they work together

daily rate of the first programmer = 1/10

daily rate of the second programmer = 1/8

daily rate when they work together = 1/x

Therefore:

1/10 + 1/8 = 1/x

solving the equation:

9/40 = 1/x

x = 40/9

1. x> -5

2. x< 8

step-by-step explanation:

1. 2x> -10

divide by 2 from both sides of equation.

2x/2> -10/2

simplify, to find the answer.

-10/2=-5

x> -5 is the correct answer.

2. 3x< 24

divide by 3 from both sides of equation.

3x/3< 24/3

simplify, to find the answer.

24/3=8

x< 8 is the correct answer.

i hope this you, and have a wonderful day!

step-by-step explanation: