Answer:
I think its 5 I'm not sure tho.....
Explanation:
640 Divide By 4 = 160
so 800 Divided By 160 = 5
It would take them 5 minutes
640/4= 160 (this is how many words they can read per minute)
800/160=5 (doing this helps us figure out how long it would take them to read 800 words)
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