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The traffic lights at three different road – crossing change after every 36 seconds,60 seconds and 72 seconds. If they change simultaneously at 8 a. m. after, whattime will they change again simultaneously? |
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Answer» Answer: 8:06am Step-by-step explanation: 36 => 2^2 × 3^2 60 => 2^2 × 3 × 5 72 => 2^3 × 3^2 therefore, LCM = 2^3 × 3^2 × 5 =8 × 9 × 5 = 72 ×5 = 360 SECONDS therefore, 360 seconds = 360/60 = 6 minutes So, after 8:00 they will change at 8:06 simultaneously |
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