A train covers a certain distance at a uniform speed.
If the train had been 8 km per hour faster, it would have taken 3 hours less than the scheduled time and if the train was slower by 8 km per hour it would have taken 5 hour more than the schedule time.
Find length of the journey.

A square pyramid has base PQRS and vertex O.
Each edge has length equal to 20.
Calculate the shortest distance along the outer surface of the pyramid from P to T, the midpoint of OR.