Amotorist is driving eastbound at the posted maximum speed along a stretch of university parkway in baltimore. the probability that the motorist approaching a red light at the san martin/39th st intersection is 0.4. the probability that the motorist encounters a red light again at the next intersection (canterbury rd) is 0.7. if the motorist does not encounter a red light at the first intersection (san martin/39th), then the probability the motorist encounters a red light at the second intersection is 0.2. if in a certain instance the motorist is observed to have encountered a red light at the canterbury rd intersection, what is the probability the motorist encountered a red light at the san martin/39th intersection