Solve exercise 3 on page 139 of Math 5 textbook

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Ngày cập nhật gần nhất: 15/4/2026

Let's refer to solving exercise 3 on page 139 of Math 5 textbook to learn how to calculate running speed and convert units to seconds for the solution.

Guidance for solving exercise 3 on page 139 of Math 5 textbook

Problem:
A person runs 400m in 1 minute 20 seconds. Calculate the running speed of that person with the unit of measurement m/second?

Solution Method:
- Convert the unit to seconds
- To find the running speed of the person, divide the distance they ran by the time taken.

Answer:
Conversion: 1 minute 20 seconds = 80 seconds.
The running speed of the person is:
400 : 8 = 5 (m/s)
Answer: 5m/s.

Here is the solution guide for exercise 2 on page 139 of Math 5 textbook focusing on concentrated practice. Additionally, this section contains two other exercises: Solve exercise 1 on page 139 of Math 5 textbook and Solve exercise 2 on page 139 of Math 5 textbook. Check out the instructions for Solve Math Grade 5 exercise on page 139 to learn Math Grade 5 effectively!

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