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210 ÷ 7 = 30
210 times.
210 ÷ 6 = 35
If the probability that a bus arrives on time 4 sevenths of a time, it means that for every 7 buses, 4 arrive on time. By deduction it also means that for every 7 buses 3 of them come late. If out of 7 buses 3 come late can you figure out how many buses out of 210 buses will be late based on the same probability? I am sure you can. Good luck!
210 minutes is 3.5 hours.