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Elena Plescan
- Junior | Next Rank: 30 Posts
- Posts: 18
- Joined: Tue Sep 16, 2014 10:14 am
Hi,
There is a problem I have doubts about.
Danny and Ian are munching on a jar full of candies. Had Danny eaten alone it would have taken him 5 minutes to finish the candies in the jar. Had Ian eaten alone it would have taken him 10 minutes to finish half the jar.Since both of them are eating simultaneously, how long would it take them to empty the jar?
A) 2.5 minutes
B) 3 minutes
C) 3 minutes and 20 seconds
D) 6 minutes and 40 seconds
E) 4 minutes
The correct answer offered by the prep soft is E.
However, if the apply the work formula, it results that
1/D+1/I=1/Total time
1/5+1/10=1/Tt
15/50=1/Tt
Tt=50/15=3 1/3 OR 3 mins 20 sec
There is a problem I have doubts about.
Danny and Ian are munching on a jar full of candies. Had Danny eaten alone it would have taken him 5 minutes to finish the candies in the jar. Had Ian eaten alone it would have taken him 10 minutes to finish half the jar.Since both of them are eating simultaneously, how long would it take them to empty the jar?
A) 2.5 minutes
B) 3 minutes
C) 3 minutes and 20 seconds
D) 6 minutes and 40 seconds
E) 4 minutes
The correct answer offered by the prep soft is E.
However, if the apply the work formula, it results that
1/D+1/I=1/Total time
1/5+1/10=1/Tt
15/50=1/Tt
Tt=50/15=3 1/3 OR 3 mins 20 sec
