Taking 6:00 AM as the starting point and time in minutes from the starting point, You get to the bust stop at 76 min.
(a) Every 9 minutes, bus run from the bus stop. So the last bus was on 72 min. So you are 4 min late. Therefore you have to wait for, 9 - 4 = 5 min.
(b) As shown earlier, you arrived 76 min after the buses begin running.
(c) The first time is 9 minutes after the starting time, which is 6:09 AM.
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