Question 4
The table below shows the bus departure timetable of two bus routes that is shown on an electronic screen of a bus station. It can be seen that at 07:00 in the morning, both buses depart from the station at the same time for the first time. If the frequency of the departure times of both buses is fixed, when will be the third time both buses will depart at the same time? Bus 1 07：00 07：07 07：14 07：21 07：28 … Bus 2 07：00 07：08 07：16 07：24 07：32 …
