Flashing Lights LCM
CAT 2001 Slot 1 · Quantitative Ability · Easy · Number Systems
This is an easy Quantitative Ability question from the CAT 2001 Slot 1 paper. It tests Number Systems. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.
A red light flashes three times per minute and a green light flashes five times in at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour?
- A.
30
- B.
24
- C.
20
- D.
60
A
Explanation
Red light flashes every . Green light flashes every . They flash together at intervals equal to . In one hour (), they flash together times.
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