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Tonkotsu
If he can type 4/5 of a page in 2/5 of an hour then in one hour and 2/5 of an hour he types a page. So it's 1 hour = 1 and 2/5s of a page hope this helps pal! 
tommyraskakeys
What I did was change both fractions into decimals:

.4 hrs = .8 pages

Then I multiplied them till they where in singular digits, like 1 instead of .2:

I got .4 x 5 and .8 x 5

Which gave me 2 and 4. I then divided them in half and got:

2 pages every 1 hour.

So your answer is: He types 2 pages/hour

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