A light flashes every 2 min, a 2nd light flashes every 2.5 min, & a 3rd light flashes every 3 min. If all 3...
145667
First 9:02,9:04,9:08,...,9:30\nSecond: 9:02.5,9:05,9:07.5,...,9:30\nLast: 9:03,9:06,9:09,...,9:30\n\nFirst and Last every 6 min\nso it will be 6,12,18,24,30\nand second will light every 5min(round),\n[6,5]=30\nso they will be light every 30min\nand your answer is 9:30
650371
knock 3 times on the ceiling...
631579
2 electrodes and a battery
1088715
3 groups in series with all the lights in each group in parallel.
63833
50 feet or about 2-3 seconds
301420
3 One to screw in the bulb and 2 to keep the beat
408524
2:00PM 799,000,000,000\n2:30PM 800,000,000,000\n3:00PM 801,000,000,000\n3:30PM 802,000,000,000\n3:45PM 803,000,000,000
395265
there is two rooms one with 3 light switches the other with 3 lightbulbs one for each switch.  you have to figure out wich switch goes to wich bulb.  you cannot see into the other room from the one you are in, and you are only allowed one trip to the room with the lightbulbs
998751
-j is correct.\nBulb 64 is ON at the end (changed 7 times by persons 1, 2, 4, 8, 16, 32, and 64).\nThe 10 light bulbs that are ON at the end were changed an odd number of times, which are light bulbs 1 (changed 1 time), 4 (3 times), 9 (3 times), 16 (5 times), 25 (3 times), 36 (9 times), 49 (3 times), 64 (7 times), 81 (5 times) and 100 (9 times).
570534
so... i think you have to do this: first you light one thread at both ends (let's call this thread 1), and the other (thread 2) only at one end. When thread 1 burns completely you have measured 30 min, so you light the other end of thread 2. When thread 2 is burnt you know 45 min have passed since you started this process...
564267
3.\nOne to change the bulb and two to make cocktails.
522524
The light is reflected
176518
Light bulb uses light waves.
1184666
(1) C\n   B = D + 2\n   M = B + 4\n   M = ( D + 2 ) + 4\n   M = D + 6\n\n(2) E\n   B = 2H\n   M = B + 6\n   M = ( 2H ) + 6\n   M = 2H + 6\n\n(3) D\n   12 bulbs / x minutes\n   12 bulbs / ( x minutes ( 1 hours / 60 minutes ) )\n   12 (60) bulbs / x ( 1 hour )\n   ( 2 (12) (60) ) bulbs / x ( 2 hours )\n\n(4) D\n   Stop 1: x\n   Stop 2: x + y\n   Stop 3: ( x + y ) / 3\n   Stop 4: ( ( x + y ) / 3 ) + 2 = ( x + y + 6 ) / 3
380519
At least more than 3 times.
61325
the Flash @ speed of light ;)
233283
a regular light bulb \nas apposed to a floresent