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Step-by-step instructions for solving exercise 4 on pages 144-145 of Math 5 textbook
Problem:
Cities A and B are 135km apart. A motorcycle travels from A to B at a speed of 42km/h. After 2 hours and 30 minutes from departure, how far is the motorcycle from B in kilometers?
Solution method:
- Convert time units to hours
- Calculate the distance the motorcycle travels in 2.5 hours by multiplying the motorcycle's speed by 2.5
- To find out how far the motorcycle is from B after 2 hours and 30 minutes, subtract the distance traveled by the motorcycle in 2.5 hours from the total distance from city A to city B.
Answer:
2 hours 30 minutes = 2.5 hours
The distance the motorcycle travels in 2.5 hours is:
42 x 2.5 = 105 (km)
The distance the motorcycle is from B is:
135 - 105 = 30 (km)
Answer: 30 km.
Here is the solution to exercise 2 on pages 144-145 of Math 5 textbook, focusing on practice. Additionally, this section includes 3 other exercises: Solve exercise 1 on pages 144-145 of Math 5 textbook, Solve exercise 2 on pages 144-145 of Math 5 textbook, and Solve exercise 3 on pages 144-145 of Math 5 textbook. You can also see the instructions for Solve Math 5 page 144, 145 to study math class 5 well!
