A freight and passenger train share the same track. The average speed of the freight train is 72 km/h, whereas that of the passenger train is 112 km/h. The passenger train is scheduled to leave 20 minutes after the freight train departs from the same station.

Determine the location where a siding would need to be provided to allow the passenger train to pass the freight train. Also determine the time it takes for the freight train to arrive at the siding. As a safety precaution, the separation headway between the two trains at the siding should be at least equal to 6 minutes.