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Document: Solving 5th-grade math on pages 66-67 in VBT Book 2, Time, exercise 134 is very useful to help students easily visualize the process, compare with solution results, especially in applying solutions to related time calculation exercises.
Solving 5th-grade math on pages 66-67 in VBT Book 2, Time, exercise 134
1. Solve Exercise 1 - Math workbook grade 5 page 66
Problem Statement:
A person walks at a speed of 4.4 km/h and covers a distance of 11 km. Calculate the time taken for the journey.
Solution Method:
To find the time taken, divide the distance by the person's speed.
Answer:
The walking time of the pedestrian is:
11 : 4.4 = 2.5 (hours)
2.5 hours = 2 hours 30 minutes
Answer: 2 hours 30 minutes
2. Solve Exercise 2 - Math workbook grade 5 page 66
Problem Statement:
An airplane flies at a speed of 650 km/h. Calculate the time it takes for the airplane to cover a distance of 1430 km.
Solution Method:
To calculate the flight time of the airplane, divide the distance by the speed.
Answer:
The flight time of the airplane is:
Answer: 2 hours 12 minutes
2.2 hours = 2 hours 12 minutes
Answer:
3. Solve Exercise 3 - Math workbook grade 5 page 67
Problem:
For a 279km journey, a car travels at a speed of 46.5 km/h. How many hours does it take for the car to complete the journey?
Solution Method
To find the time it takes for the car to complete the journey, divide the distance by the speed.
Answer
The time it takes for the car to complete the journey is:
279 : 46.5 = 6 (hours)
Answer: 6 hours
4. Solve Problem 4 - Math workbook grade 5 page 67
Problem Statement:
A motorcycle travels a distance of 250m in 20 seconds. Calculate the time it takes for the motorcycle to cover a distance of 117km with the same speed.
Solution Method
- Convert: 117km = 117,000m
- Find the speed of the motorcycle in meters per second.
- Calculate the time for the motorcycle to travel a distance of 117km or 117,000m by dividing the distance by the speed.
Answer
Convert: 117km = 117,000m
The motorcycle's speed is:
250 : 20 = 12.5 (m/s)
The time for the motorcycle to travel a distance of 117km is:
117000 : 12.5 = 9360 (seconds)
9360 seconds = 156 minutes = 2 hours 36 minutes
Answer: 2 hours 36 minutes.
You are viewing the guidance for solving 5th-grade math on pages 66-67 in VBT Book 2, Time, with some exercises from 134. You can review the guide for Solving 5th-grade math on pages 65-66 in VBT Book 2 Practice or preview the guide for Solving 5th-grade math on pages 67-68 in VBT Book 2 Practice to better understand the lesson.
Best wishes to all students for success in mathematics.
