Solve Exercise 3 on page 141 of Math 5 textbook.

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Ngày cập nhật gần nhất: 15/4/2026

With detailed instructions, Exercise 3 on page 141 of Math 5 textbook falls under the topic of Distance. Calculating the length of segment AB helps students understand how to calculate distance and the fastest method for solving distance calculation problems.

Guidance to solve Exercise 3 on page 141 of Math 5 textbook

Problem:
A motorcycle travels from point A at 8:20 AM with a speed of 42km/h and arrives at B at 11:00 AM. Calculate the length of segment AB.

Solution Method:
- Given Data:
+ Departure time of the vehicle: 8:20 AM
+ Arrival time of the vehicle: 11:00 AM
+ Speed of the motorcycle: 42 km/h
- Problem Requirement: Calculate the distance AB
- Solution Approach:
+ Calculate the travel time of the motorcycle by subtracting the departure time from the arrival time, convert the result to hours.
+ Calculate the length of segment AB by multiplying the speed of the motorcycle by the travel time of the motorcycle.

Answer:
The travel time of the motorcycle is:
11:00 AM - 8:20 AM = 2 hours 40 minutes
Convert: 2 hours 40 minutes = 8/3 hours
The length of segment AB is:
42 x 8/3 = 112 (km)
Answer: 112km.

Here is the solution guide for exercise 3 on page 141 of Math 5 textbook focusing on practice. Additionally, this section also includes instructions for solving Exercise 1 and Exercise 2 on the same page to help students learn Mathematics Grade 5 effectively.

Frequently Asked Questions

What are the steps to calculate the distance in Exercise 3?

To calculate the distance in Exercise 3, first determine the travel time by subtracting the departure time from the arrival time. Then, multiply the travel time in hours by the speed of the motorcycle, which is 42 km/h.

How can students effectively solve distance problems in Mathematics?

Students can effectively solve distance problems by understanding the relationship between speed, time, and distance. Practice through various exercises, such as those in the Math 5 textbook, helps reinforce these concepts.

What is the calculated distance from point A to point B in this exercise?

The calculated distance from point A to point B, based on the given speed and travel time, is 112 km. This is determined by multiplying the speed of 42 km/h by the travel time of 8/3 hours.

What should students do to master distance calculations in Grade 5 Mathematics?

To master distance calculations in Grade 5 Mathematics, students should practice exercises like Exercise 3, review instructional materials, and apply problem-solving strategies consistently to gain confidence and proficiency.

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