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

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

& Closest answer is 3/4.....
A searchlight on top of the watch-tower makes 3 revolutions   [#permalink] 08 Oct 2014, 15:29
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