Calculate the speed of the kayak in Exercise 4 on pages 139-140 of Math 5 textbook.

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Ngày cập nhật gần nhất: 15/4/2026

Follow the instructions for Exercise 4 on pages 139-140 of Math 5 textbook to determine the speed of the kayak when the distance covered from 6:30 to 7:45 is 30km.

Step-by-step instructions for Exercise 4 on pages 139-140 of Math 5 textbook.

A kayak travels from 6:30 to 7:45 and covers a distance of 30km. Calculate the speed of the kayak.

Formulas to apply to solve the exercise:
- Time calculation formula: t = s : v (Time equals distance divided by speed)
- Speed calculation formula: v = s : t (Speed equals distance divided by time).

Method 1:
The travel time of the kayak is:
7 hours 45 minutes - 6 hours 30 minutes = 1 hour 15 minutes
1 hour 15 minutes = 1.25 hours
The speed of the kayak is:
30 : 1.25 = 24 (km/hour)
Answer: 24 km/hour.

Method 2:
The travel time of the kayak is:
7 hours 45 minutes - 6 hours 30 minutes = 1 hour 15 minutes
1 hour 15 minutes = 75 minutes
The speed of the kayak is:
30 : 75 = 0.4 (km/minute)
0.4 km/minute = 24 km/hour
Answer: 24 km/hour.

Here is the solution to exercise 4 on pages 139-140 of Math 5 textbook, focusing on practice. Additionally, this section includes 3 other exercises: Solve exercise 1 on pages 139-140 of Math 5 textbook, Solve exercise 2 on pages 139-140 of Math 5 textbook, and Solve exercise 3 on pages 139-140 of Math 5 textbook.

Frequently Asked Questions

How do you calculate the speed of a kayak covering a distance of 30 km?

To calculate the speed of the kayak, use the formula v = s : t, where 'v' is speed, 's' is distance, and 't' is time. Given that the kayak covers 30 km in 1.25 hours, the speed is 30 km divided by 1.25 hours, resulting in a speed of 24 km/hour.

What are the time and distance parameters for this kayak exercise?

In the kayak exercise, the time duration is from 6:30 to 7:45, covering a distance of 30 km. This duration amounts to 1 hour and 15 minutes, which can be converted to 1.25 hours for calculations.

Is there an alternative method to calculate the speed of the kayak?

Yes, an alternative method involves converting the travel time into minutes. The kayak takes 75 minutes to cover 30 km, allowing you to calculate the speed as 30 km divided by 75 minutes, which equals 0.4 km/minute or 24 km/hour.

Where can I find the step-by-step instructions for Exercise 4?

The step-by-step instructions for Exercise 4 can be found on pages 139-140 of the Math 5 textbook. These instructions guide students through the process of calculating the speed of the kayak based on the provided distance and time.

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