THE PUZZLET PAGE


PUZZLET 176

A Control Panel Problem

A control panel has four lamps, A through D. 43 seconds after switch-on, lamp A flashes briefly on then off.  This will repeat every 43 seconds.

47 seconds after switch on, lamp B will also flash briefly. It flashes again every 37 seconds thereafter.

control panel

Lamp C flashes 49 seconds after switch-on, then every 97 seconds.

57 seconds after switch-on, lamp D flashes, after which it flashes every 79 seconds.

Will all lamps ever be on at the same time? If so, when? How many times will each have flashed?


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Last Updated: January 17th, 2010.