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Work & Time - Quant/Math - CAT 2010
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 |
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(2) |
24 |
| (3) |
20 |
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(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 
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