Two interesting tasks

1. Motorcyclist and riding

A motorcyclist was sent from the post office to the airport on arrival.
The plane arrived before the deadline, and the brought mail was sent to the post office
with riding. Having driven for half an hour, the horseman met a motorcyclist, who accepted the mail, and, without stopping, turned back.
The motorcyclist arrived at the post office 20 minutes earlier than it should.
How many minutes before the deadline did the plane arrive at the aerodrome?

2. On foot and by car

Anyone who has understood the solution of the previous problem can easily find the solution of the next problem of the same kind.
An engineer working outside the city, arrives daily at the station at 8.30 am. Exactly at the same time, approaching the station "Volga" and, without stopping, drove the engineer to the factory.
One day an engineer arrived at the station at 7 o'clock and, without waiting for the car, went on foot to the factory. Having met the Volga on the way, he got into it and arrived at the plant 10 minutes earlier than usual.
Determine what time the clock showed at the time of the meeting of the engineer with the "Volga" and how many times slower
he goes on foot than goes by car.

PS Comments have answers to the problems.