William britton types 64 words per minute on his computer. how many words can he type in 90 seconds?

Hello!
The answer is 96 words.
He can type 32 words every 30 seconds, 64 words for 60 seconds or 1 minute and 96 words for 90 seconds.
:)

He can type 96 words per minute.
A minute equals 60 seconds. So he can type 64 words, in 60 seconds. 
90 seconds, is a minute and a half. 
So you take 64, and divide it by 2, which equals 32.
Which means that he types 32 words per 30 seconds.
So 64+32=96

The answer is d. 16^2 + 63^2 = x^2hope this .