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# A searchlight on top of the watch-tower makes 3 revolutions

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Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Technology, Entrepreneurship
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
GMAT 10: 740 Q V
GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
WE: Engineering (Manufacturing)
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Re: Probability - Search Light [#permalink]

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06 Sep 2011, 08:56
3 revolutions in 1min=in 60 sec

so 1 rev in 20 sec-> 1/4 rev in 5 sec-> so prob of person remaining in dark for 5 sec is 3/4

so its E
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Re: A searchlight on top of the watch-tower makes 3 revolutions [#permalink]

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21 Jul 2014, 01:01
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A searchlight on top of the watch-tower makes 3 revolutions [#permalink]

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08 Oct 2014, 15:29
A very literal solution...

One minute <-------------|---------------|---------------->
************************** 14-24 **********36-44*************

Segment at which darkness will intercede 5 seconds

Time between 15+9+15 = 13/20

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Re: A searchlight on top of the watch-tower makes 3 revolutions [#permalink]

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14 Jan 2016, 03:53
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A searchlight on top of the watch-tower makes 3 revolutions   [#permalink] 14 Jan 2016, 03:53

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