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24 Sep 2020, 06:30
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
73% (01:39) correct
27%
(01:42)
wrong
based on 167
sessions
History
Date
Time
Result
Not Attempted Yet
A beacon flashes its light every 12 seconds, another every 18 seconds and a third every minute. First time, the three beacons flash simultaneously at 6.30 pm. At what time will the three beacons flash simultaneously second time?
A. 6.32 pm
B. 6.33 pm
C. 6.36 pm
D. 6.38 pm
E. 6.39 pm
A. 6.32 pm
B. 6.33 pm
C. 6.36 pm
D. 6.38 pm
E. 6.39 pm
24 Sep 2020, 06:38
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A beacon flashes its light every 12 seconds, another every 18 seconds and a third every minute. First time, the three beacons flash simultaneously at 6.30 pm. At what time will the three beacons flash simultaneously second time?
A. 6.32 pm
B. 6.33 pm
C. 6.36 pm
D. 6.38 pm
E. 6.39 pm
Explanation:
three beacons flash simultaneously at the LCM of 1st,2nd and 3rd timing of flash
i.e LCM of 12 sec,8 sec,60 sec
LCM(12,18,60)=180 sec
thus beacons will flash simultaneously at every 3 minute(i.e 180 sec)
Next beacon flash= first flash time+ 3 min
=6:30 pm +3 min
=6:33 pm
Hence B is the correct answer.
A. 6.32 pm
B. 6.33 pm
C. 6.36 pm
D. 6.38 pm
E. 6.39 pm
Explanation:
three beacons flash simultaneously at the LCM of 1st,2nd and 3rd timing of flash
i.e LCM of 12 sec,8 sec,60 sec
LCM(12,18,60)=180 sec
thus beacons will flash simultaneously at every 3 minute(i.e 180 sec)
Next beacon flash= first flash time+ 3 min
=6:30 pm +3 min
=6:33 pm
Hence B is the correct answer.
24 Sep 2020, 11:42
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Bunuel
6:30 PM + LCM ( 12 , 18 , 60 ) = 6 : 33 PM, Answer must be (B)
