Here is another one (at last but not ar least)...
Three utility lights are set on timers. The first flashes every 15 seconds, the second flashes every 17 seconds, and the third flashes every 20 seconds. If, at given moment, the three lights flashs at exactly the same time, how many seconds will elpase before the next such ocurrance=
a. 30
b. 255
c. 510
d. 1,020
e. 5,100
Thanksin advance
Three utility lights are set on timers. The first flashes every 15 seconds, the second flashes every 17 seconds, and the third flashes every 20 seconds. If, at given moment, the three lights flashs at exactly the same time, how many seconds will elpase before the next such ocurrance=
a. 30
b. 255
c. 510
d. 1,020
e. 5,100
Thanksin advance
