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raquelwilliams5795
06.12.2019 •
Mathematics
Joseph had to type an article containing 10,000 words. how many minutes did it take him? (1) joseph and kelly together can type a 75,000-word article in an hour and a half. (2) joseph types twice as fast as kelly does.
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Ответ:
0.3 hour or 18 minutes
Step-by-step explanation:
Kelly types half as fast as Joseph, so in the time it takes Joseph to type 10,000 words, Kelly can type 5000. That means they can type 15,000 words working together for that time. We are given their "working together" typing speed, so we can write the proportion ...
(time for 15000 words)/(15000 words) = 1.5 hours/(75000 words)
Multiplying by 15000 gives ...
(time for 15000 words) = (1.5 hours)×(15000/75000) = 1.5/5 hours
time for 15000 words = 0.3 hours = 18 minutes
Joseph can type a 10,000 word article in 0.3 hours, or 18 minutes.
Ответ:
30/7
Step-by-step explanation: