Question 15
Three lamps change color continuously according to these repeating rules.
- Lamp I cycles blue, red, purple, yellow, changing every 3 seconds.
- Lamp II cycles blue, purple, yellow, changing every 4 seconds.
- Lamp III alternates blue, red, changing every 5 seconds.
Just now lamps I,II,III have respectively changed to blue,purple,red. How long until their colors are respectively red,purple,blue?
- Lamp I cycles blue, red, purple, yellow, changing every 3 seconds.
- Lamp II cycles blue, purple, yellow, changing every 4 seconds.
- Lamp III alternates blue, red, changing every 5 seconds.
Just now lamps I,II,III have respectively changed to blue,purple,red. How long until their colors are respectively red,purple,blue?