quantitative aptitude test 103

Test # 103
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1. 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?

Quantitative Aptitude
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turn out (a light)
to make a light go out
I always turn out the light if I do not need it.
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