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7.34 At one signalized intersection approach, 20 vehicles, on average, arrive during the 30-second effective green...

7.34 At one signalized intersection approach, 20
vehicles, on average, arrive during the 30-second
effective green time. During the rest of the cycle, 45
vehicles, on average, arrive at the intersection from this
approach. The cycle length is 90 seconds. What is the
proportion of vehicles arriving on green for this
approach?

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