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erykp17
23.10.2019 •
Mathematics
Gary and his assistant can rake the sand on a beach volleyball court together in 24 minutes. if his assistant could do it alone in one hour, how quickly could gary rake the court by himself?
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Ответ:
40 minutes
Step-by-step explanation: The two of them could rake it in 24 minutes
Let x represent the minute the assistant can work alone and y represent the minutes Gary can work alone
Let the job required to be done be 1, then Gary can rake 1/y and the assistant can rake 1/x
i.e 1/x + 1/ y = 1/24
substituting the time it will take the assistant
⇒ 1/60 + 1/y = 1/24
1/y = 1/24 - 1/60
1/y = 1/40
therefore y = 40 minutes
i.e it will take Gary 40 minutes
Ответ:
Number 7 answer is 25.2 and 8 is 23 and 9 is 23