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John works twice as fast as Peter, but John takes a half hour break af [#permalink]
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Kudos
NAME. R T W
Jhon. 1/5. 1.5h. 3/10
Peter. 1/10. 3h. 3/10

The first 3 hours: they completed 3/10+3/10 = 6/10 of the job

To complete: 6/10 x (remaining time) = 1 (job) ==> remaining time = 1.666hours = 1hour 40 min

3h + 1h 40min = 4h 40min

Is this correct?
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Re: John works twice as fast as Peter, but John takes a half hour break af [#permalink]
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Re: John works twice as fast as Peter, but John takes a half hour break af [#permalink]
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