Question

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

Answer 1

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

Answer 2

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.
:)