In this section, you will learn to solve the following problems:

The wolf runs, Kotaro chases, and the wolf is in front of Kotaro 120.

In meters, the big wolf runs 60 meters per minute, and Kotaro runs 70 meters per minute.

Kotaro can catch up with Big Wolf in a few minutes.

Check the answer time:

By analogy:

Example1:Ship A and Ship B leave from two docks at the same time, with the same direction. Ship B is ahead, traveling at a speed of 24 kilometers per hour, and ship A is traveling at a speed of 28 kilometers per hour. Four hours later, Ship A overtook Ship B. How many kilometers are the two docks apart?

Exercise: The enemy fled at the speed of 4 kilometers per hour ahead, and our cavalry pursued at the speed of 12 kilometers per hour, and caught up with the enemy in 3 hours. How many kilometers are the two sides apart?

Compare who is the best:

Example 2: A and B are 4 kilometers apart, with B in the front and A in the back, and both of them start in the same direction at the same time. Two hours later, A caught up with B, who was 6 kilometers per hour. A How many kilometers per hour?

Practice: 1. Lao Wang and Lao Zhang have a meeting from place A to place B, and Lao Zhang rides his bike every hour15km. It takes Lao Wang two hours to start, and three hours to catch up with Lao Zhang. Ask Lao Wang the speed of cycling.

2. In the morning 10, a cargo ship set sail from a port, and at 2 pm, a passenger ship set sail from this port. The passenger ship sailed 12 hours to catch up with the cargo ship, and the passenger ship was 20 kilometers per hour. How many kilometers per hour is this cargo ship?

Two planes, A and B, took off from an airport at the same time and flew in the same direction. A travels 300 kilometers per hour and B travels 340 kilometers per hour. After a four-hour flight, how many kilometers are they apart? At this time, if A catches up with B in 2 hours, how many kilometers will A fly per hour?

There should be applause here.

Example 3: Distance between two cars 1500m. Car A is in front of car B, which travels 6 10m per minute and 660m per minute. How many minutes does it take for B car to catch up with A car?

Practice: 1. My brother and younger brother went to school. After the younger brother walked out of the house 100 meters, the older brother set out from home. My brother walks 75 meters per minute, and my brother walks 65 meters per minute. They both walked towards the school at the same time. How many minutes did it take to catch up with my brother?

2. The People's Liberation Army performs marching tasks. The troops started from a certain place and marched at the speed of 12 km per hour. Seven hours later, the correspondent rode a motorcycle and caught up with the troops at a speed of 54 kilometers per hour to convey the order. He can catch up with the troops in a few hours.

Our cavalry pursued the enemy at the speed of 2 1 km per hour. When we arrived somewhere, we learned that the enemy had escaped two hours ago. It is known that the enemy's escape speed is15km per hour. How many hours can the cavalry catch up with the fleeing enemy?

A car travels from place A to place B at a speed of 30 kilometers per hour. Four hours later, a train also traveled from A to B. The speed of the train is three times that of the car. How many hours will the train catch up with the bus?

There should be flowers here.

This task:

1, (1) Party A and Party B respectively walk eastward from Village A and Village B, which are 18km apart. Party A travels by bike14km and walks 5km. How many hours can A catch up with B?

(2) Party A and Party B respectively walk eastward from Village A and Village B, which are 18km apart. Party A rides a bike and Party B walks. After two hours, Party A catches up with Party B.. It is known that A travels 14 kilometers per hour, and how many kilometers does B travel per hour?

(3) Both Party A and Party B drive eastward from Village A and Village B respectively. Party A rides bike every hour14km, and Party B walks 5km every hour. Two hours later, Party A catches up with Party B and asks for the distance between Village A and Village B?

The enemy's car runs at the speed of 60 kilometers per hour. After 1 hour escape, our army followed at a speed of 80 kilometers per hour. How many hours will it take to catch up with the enemy car?

3. Master and apprentice make parts, and apprentice makes 10 pieces every hour. It has been 20 hours before the master began to work. The owner makes 15 pieces per hour. How many hours later, the master and the apprentice will get the same number?

Test you:

1.400 m circular runway, A and B start from the starting line at the same time. A runs 4 meters per second, and B runs 6 meters per second. They ran in the same direction. How many seconds after they set out, did they meet for the first time?

2. A and B race, A runs.

At 200 meters, B is 20 meters behind. When B runs 540 meters, how many meters is A in front of B?