Subject | Subject

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1. Vocabulary

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motion: chuyển động​

distance: quãng đường

speed: vận tốc

time​: thời gian​

apart: ​cách nhau/ có khoảng cách

2. Problem

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​Minh left the pizza store by car at 1:30p.m and arrived home at 2:00p.m. The distance from his house to the pizza store was 800m. How many meters an hour did Andy travel?

• To find the speed:

  divide the total distance travelled by the total time taken.​

  v = s ÷​ t

Subject | Subject

Some text here about the topic of discussion

3. Key point

• To find the speed:

  divide the total distance travelled by the total time taken.​

  v = s ÷​ t

• To find the total time taken:

  divide the total distance travelled by the speed.

  t = s ÷​ v

Subject | Subject

Some text here about the topic of discussion

3. Key point

• To find the speed:

  divide the total distance travelled by the total time taken.​

  v = s ÷​ t

• To find the total time taken:

  divide the total distance travelled by the speed.

  t = s ÷​ v

• To find the total distance:​

  multiply the speed and the total time taken together

  s = v ×​ t

Subject | Subject

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3. Key point

3.a)

Two trains leave a city at the same time.

One train is travelling east at an average speed of 90 kilometers per hour, while the other train is travelling west at an average speed of 120 kilometers per hour.

In how many hours will they be 1260 kilometers apart?

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3. b)

Brook and Saint Cities are 3800 kilometers apart. Peter leaves Brook travelling towards Saint at a speed of 425 kilometers per hour. Max leaves Saint, the same time, travelling towards Brook at a speed of 525 kilometers per hour.

How many hours will it take them to meet?​

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3. c)

​Rosy left the shopping mall and traveled toward her home. Exactly one hour later, Tony left from the same point to catch up with her. Rosy traveled 50 km/h while Tony traveled at 60 km/h.

How long does it take Tony to catch up with Rosy?

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