Ana can complete the 5 products in 4 hours while Boy can complete 5 products in just 2 hours. How long would take them to complete 15 products if they work to?

Question

let x the time of they work 

Answer 1

Ana's rate per hour = 5 products/4 hours

 

  =5/4

 

Boy's rate per hour = 5 products/ 2 hours

 

 = 5/2

 

x=hours it takes them working together to complete 15

 

5/4(x) + 5/2(x) = 15

 

5x/4 + 10x/4 = 15

 

15x/4 =15

 

x=15(4/15)

 

x =4

 

it would take 4 hours of them working together