Meeting for the first time shows that running faster is one lap slower than running.

That is to say, A ran one lap more than B.

320 tons -280 tons =800

t=20

(2)

The speed of passenger cars can be set to 3X meters per second, and the speed of freight cars can be set to 2X meters per second.

Two cars meet, two cars leave, and the length of two cars running in parallel is the length of two cars.

(3X+2X)* 16=200+280

5X=30

X=6

The speed of passenger cars is18m per second, and the speed of freight cars is12m per second.

(3)

1. The speed of pedestrians is 3.6 kilometers per hour.

An hour is 3600 seconds.

3600 m /3600 s = 1 m/s

The speed of people is 1 meter per second.

Similarly, the speed of a cyclist is 3 meters per second.

The time to overtake pedestrians is 22 seconds.

The train passed the length of the train in 22 seconds.

The time to overtake the cyclist is 26 seconds.

The train went 22 seconds ahead of the cyclist.

Suppose the length of the train is x meters and the speed of the train is y meters per second.

Y*22- 1*22=X

Y*26-3*26=X

Y= 14 X=286。

The length of this train is 286 meters.

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hope this helps