Question

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.

Answer 1

it would be In 17 hours

Explanation:

let me know if I am wrong or right thxs

Answer 2

4 4/17 hours

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