A road has two sets of traffic lights, which alternate between red and green. The first set is red for 15 seconds and green for 40 seconds. The second set is red for 35 seconds and green for 15 seconds. It takes a car 60 seconds to travel between the first and second set. A pedestrian sees both sets of lights change to red at the same time. How long does he have to wait until he sees a car that is just stopped by the first set turning red which will go on to be just stopped by the second set turning red?
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Home » Mathematics » A road has two sets of traffic lights, which alternate between red and green. The first set is red for 15 seconds and green for 40 seconds. The second set is red for 35 seconds and green for 15 seconds.