Question

Three light bulbs start
blink together at internal of
Bu min and 90 min A
What time interval slink
together again?
Go min​

Answer 1

answer:

hello there , this is your required answer,

Call the switches 1, 2 and 3. Leave Switch 1 off. Turn Switch 2 on for five minutes and then turn it off. Turn Switch 3 on. Enter the room. If a bulb is on, it's controlled by Switch 3. Feel the light bulbs for heat. The warm bulb is controlled by Switch 2. The bulb that is off and cold is controlled by Switch 1

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