3 neon signs are turned on the same time the first one blinks after every 10 seconds the second one after every 20 second and the third one after every 25 seconds when will they be linked together again if the blink last at 9 p.m.
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Answer:
9pm 1 min 40 sec
Step-by-step explanation:
lcm of 10,20,25=100
so they will next blink 100 seconds after 9pm
that is 09:01:40 pm
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