Train Departure Timings and Synchronisation

Train services \(A\) and \(B\) depart from the same train depot. Train service \(A\) departs every \(18\) minutes and train service \(B\) departs every \(25\) minutes. Both train services start service and leave the depot together at \(6\) am every day.

1. How many hours would have passed for the trains to depart together again?[3]
2. Both services stop operating at \(10\) pm; departures occur on their stated schedules up to that time. Determine the number of times per day that both trains depart together from the train depot.[2]