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26 Jun 2006, 01:06
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Jon can complete a piece of work in 30mins while Paul takes 45mins to complete the piece of work. Working together, and at the same respective speeds, how long will it take Jon and Paul to complete the piece of work?
A) 12.5 minutes
B) 13 minutes
C) 15.5 minutes
D) 18.5 minutes
E) 20 minutes
A) 12.5 minutes
B) 13 minutes
C) 15.5 minutes
D) 18.5 minutes
E) 20 minutes
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26 Jun 2006, 05:11
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I agree answer is 18 mins. the choice is incorrect.
Here is how I worked it out.
Jon takes 30 mins to complete a job so in 1 min he completes 1/30 th of the job
and paul completes 1/45 th of the job,
together they complete,
1/30 + 1/45 of the job in 1 min
that is 1/18 of a job in 1 min.
So it will take them 18 mins to complete the entire job working together.
Here is how I worked it out.
Jon takes 30 mins to complete a job so in 1 min he completes 1/30 th of the job
and paul completes 1/45 th of the job,
together they complete,
1/30 + 1/45 of the job in 1 min
that is 1/18 of a job in 1 min.
So it will take them 18 mins to complete the entire job working together.
