One,

Travel application problem

Travel distance

=

speed

*

time

that is

S=vt

( 1)

Encountered a problem: the distance A walked.

+

B's journey

=

whole journey

(2)

Follow up questions:

(The armor is fast)

1.

At the same time, the difference is: A's time

=

B time

A's journey

-

B's journey

=

The original distance between a and b.

2.

Different places in the same place; once

=

B time

-

equation?of?time;?time?difference

A's journey

=

B's journey

(3)

Sail on water (in the air)

Downstream velocity

=

The speed of a ship in still water

+

water velocity

Countercurrent velocity

=

The speed of a ship in still water

-

water velocity

(

four

) the problem of getting on (off) the bridge

1

The bridge on the vehicle refers to the process from the front contact bridge to the rear contact bridge of the vehicle, and the driving distance is one vehicle length.

2

The distance from the bridge means the distance from the front of the car to the rear of the car. Journey is a kind of growth.

three

Car crossing the bridge refers to the distance from the front of the car touching the bridge to the rear leaving the bridge, and the car is the conductor.

+

Bridge length

four

The car on the bridge refers to the distance from the rear of the car to the front of the car leaving the bridge, and the road is the length of the bridge.

-

Train attendant