Allison can complete a sales route by herself in 6 hours.

Question

Allison can complete a sales route by herself in 6 hours. Working with an associate, she completes the route in 4 hours. How long would it take her associate to complete the route by herself?

Answer 1

So, Allison averages 1/6 of the route every hour, right?

 

1/6 + 1/a = 1/4

 

Once we apply the common denominator, 12a, we only wirk with the numerators.

 

2a + 12 = 3a

a = 12

 

Her associate can finish the route in 12 hours by herself.