
Work & Time  Quant/Math  CAT 2013
Question 4 the day:
August 08, 2003
The question for the day is from the topic of Work & Time.
 A red light flashes 3 times per minute and a green light flashes 5 times in two minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?
(1) 
30 
 
(2) 
24 
(3) 
20 
 
(4) 
60 
Correct Answer  (1)
Solution:
Red light flashes every 20 seconds
Green light flashes every 24 seconds
Therefore, they will flash together every 120 seconds
In every hour they will flash



