Use the proportion
=
or
= .
The proportion says that the rate of typing remains the same in both cases.
From the proportion, find
x = = 30*20 = 600 minutes = 10 hours. ANSWER
Solved.
Answer by VFBundy(438) (Show Source): You can put this solution on YOUR website! Michael types 250 words in 20 minutes. This means he types 250/20 words...or 12.5 words...per minute.
It will take Michael 7500/12.5 minutes...or 600 minutes...to type 7500 words.
600 minutes is 600/60 hours...or 10 hours. It will take Michael 10 hours to type 7500 words.
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You could also do it like this:
Michael types 250 words in 20 minutes.
This means he could type 750 words in 60 minutes.
This means he could type 750 words in 1 hour.
This means he could type 7500 words in 10 hours.