Question
Four lights blink at intervals of 18 seconds, 24 seconds,
36 seconds, and 48 seconds respectively. How many times will all the lights blink together in 3 hours?Solution
ATQ,
All the lights will blink together after 144 seconds (LCM of 18, 24, 36 and 48)
3 hours = 180 minutes
Therefore, required number of times ≤ (180 × 60) ÷ 144 = 75
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