You give tours on the Great Lakes and
talk about points of interest. A lighthouse
typically has 2 beacons that rotate
together-but not necessarily facing
opposite directions. In that way, it can be
a shorter time between the first and
second flashes than between the second
flash and the third flash (when the first
beacon comes around for the second
time). One way of identifying which
lighthouse you are looking at is to find
the ratio of the short time between
flashes to the long time between flashes.
If the beacons are set 120° apart along
the rotation, as shown below, what is this
ratio?