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Interview Question

Product Engineer Trainee Interview(Student Candidate) Mumbai

In the 2nd round they asked: 1. An egg has to be boiled

  which takes exactly 11 minutes to boil. There are only 2 sand watches available to you one of 9 minutes and the other of 5 minutes. Using only these sand watches boil the egg.
Answer

Interview Answer

4 Answers

17

2. A shopkeeper sells 1 new bottle of cold drink in exchange of 5 empty bottles of cold drink. A guy had a party last Friday for which he bought 77 bottles of cold drink. After the party the guy has 77 empty bottles of cold drink. How many new bottles can the guy buy?

Interview Candidate on 25-Sep-2015
2

It takes 4 flips to calculate 11 minutes. You have tu turn both sand watches same time as anyone of them is been finished first.
$ = 1 minute and @ = Flip.
$$$$$@$$$$@$@$
Explanation: Once 5 minute over and flip both watches. Timer is 4 minute and 5 minute as 4 minute over flip the watch so till now 9 minutes over now watches running for 1 minute and 9 minute. Once 1 minute over flip watches again watches running for 1 Minute and 5 Minute. Once one minute watch is finished egg is cooked.

Latesh Kolhe on 14-Jan-2016
1

It takes 4 flips to calculate 11 minutes. You have tu turn both sand watches same time as anyone of them is been finished first.
$ = 1 minute and @ = Flip.
$$$$$@$$$$@$@$
Explanation: Once 5 minute over and flip both watches. Timer is 4 minute and 5 minute as 4 minute over flip the watch so till now 9 minutes over now watches running for 1 minute and 9 minute. Once 1 minute over flip watches again watches running for 1 Minute and 5 Minute. Once one minute watch is finished egg is cooked.

Latesh Kolhe on 14-Jan-2016
1

I ll start both watch
After 5 mins I ll have 4 remaining in 9 min watch and 5 min watch will go down
Then I ll start 5 min watch again
When 9 min watch finishes it's time we will have 1 min remaining in 5 min watch
Now I ll start 9 min watch again in 1 min I ll have 1 min sand down in 9 min watch and 5 min watch will have all its sand down
Until now we are done with 10 mins with 5 min watch used 2 times
Now we will use 1 min sand which is down in 9min watch to calculate 11 th min

Varad on 17-Aug-2016

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