Question 140 | Mathematics ENEM 2024 Yellow Test
7To improve the flow of buses on an avenue with two traffic lights, the city government will reduce the time each traffic light is red, which is currently 15 seconds every 60 seconds. Assume that the time a bus arrives at each traffic light is random.
The city government's traffic engineer calculated the probability of a bus encountering each of them as red, obtaining 15/60. From there, he established an equal reduction in the amount of time, in seconds, that each light will be red, so that the probability of a bus encountering both red lights on the same trip is equal to 4/100, considering independent events.
To achieve this, the reduction in the time in which the signal will be red, in seconds, established by the engineer was
A) 1.35
B) 3.00
C) 9.00
D) 12.60
E) 13.80
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