Answer:
Joseph take 18 minute to type 10,000 words
Step-by-step explanation:
Given Data
J (Joseph) and K (Kelly) together type=75,000 words at 90 minutes
Means J+K=75,000 at 90 minutes
Joseph types twice of Kelly
Means J=2xK
To find
Joseph type =10000 words at time=?? minutes
Solution
J+K=75,000
As we Known J=2xK
So
2K+K=75,000
K=75,000/3
K=25,000 Means Kelly typed 25,000 words out of 75,000
J=75,000-25,000
J=50,000 Means Joseph typed 50,000 words out of 75,000
So Joseph Typed 50,000 words at 90 minutes and each word time taken as
J=50,000/90
Joseph typed=555.5 words per minute
Now For Joseph type 10,000 words at time
J=10,000/555.5
Joseph Time taken=18 minutes to type 10000 words
