Working alone, Jacob can paint a fence in nine hours. Molly can paint the same
fence in eight hours. Find how long it
would take them if they worked together.

it would be In 17 hours

Step-by-step explanation:

let me know if I am wrong or right thxs

4 4/17 hours

Step-by-step explanation:

In one hour Jacob can paint 1/9 of the fence

In one hour Molly can paint 1/8 of the fence

This equation can determine how long it would take if they worked together:

1/9x + 1/8x = 1

multiply each term by lcm of 72 to eliminate denominators to get:

8x + 9x = 72

17x = 72

x = 72/17

x = 4 4/17 hours

the answer is 99.