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

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Author Message
TAGS:
Joined: 31 Dec 1969
Location: United States
Concentration: Marketing, Other
GMAT 1: 710 Q49 V38
GMAT 2: 660 Q V
GPA: 3.64
WE: Accounting (Accounting)
Followers: 0

Kudos [?]: 50 [0], given: 74641

Re: Probability - Search Light [#permalink] New post 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
Re: Probability - Search Light   [#permalink] 06 Sep 2011, 08:56
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