Answer:
If they work together, they will take 2 2/9 hours to fill the order
Step-by-step explanation:
An experience clerk can fill a certain order in 4 hours
A new clerk needs 5 hours.
How long will it take for them to fill the order?
The first step, find how much order they can complete in an hour
I will give an experieced clerk as A and the new clerk as B
A can finish 1/4 order in an hour
B can finisih 1/5 order in an hour
Second, if they work together, so
(1/4 + 1/5) order will be done in an hour
1/4 + 1/5 = 5/20 + 4 /20 = 9/20
To complete the whole task, it will take :
= 20/20 or 1 : 9/20
= 1 x 20/9
= 2 2/9 hour
