Hello! Well first what we can do is take the amount minutes and make it into two hours. Two hours equate to 120 minutes, dividing that by 15 minutes will give us 8. Now we take 8 and multiply that by the amount of words he's typed in those 15 minutes, which means that he will type 4,560 words in two hours.
what we can do here is take the number 570 and divide it by 15 to get a unit value. 570/15 =38. Sam can type 38 words per minute. So there are 120 minutes in 2 hours, so multiply the amount per minute (38) by 120. 38*120 is 4560. Answer 2.
