Math Problem Statement

Ví dụ 8. Một ca nô đi xuôi khúc sông từ A đến B hết 1 giờ 10 phút và đi ngược dòng từ B về A hết 1 giờ 30 phút. Biết vận tốc dòng nước là 2 km/h. Tính vận tốc riêng của ca nô. Ví dụ 9. Một ca nô xuôi dòng từ A đến B mất 5 giờ và ngược từ B đến A mất 7 giờ. Tính khoảng cách giữa hai bến A và B, biết vận tốc của dòng nước là 3 km/h.

Solution

It seems you've uploaded a file with some mathematical problems related to boat movement in a river. Let's break down the problems:

Problem 8: A boat moves downstream from A to B, taking 1 hour and 10 minutes, and goes upstream from B to A, taking 1 hour and 30 minutes. The river's current speed is 2 km/h. The task is to calculate the boat's own speed (its speed in still water).

Problem 9: A boat moves downstream from A to B, taking 5 hours, and upstream from B to A, taking 7 hours. The river current's speed is 3 km/h. The goal is to calculate the distance between points A and B.

Would you like me to start solving these problems in detail?

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Boat Movement
Relative Speed
Speed, Time, and Distance
River Current Effect

Formulas

Speed = Distance / Time
Downstream Speed = Boat Speed + River Speed
Upstream Speed = Boat Speed - River Speed

Theorems

Relative Speed Theorem

Suitable Grade Level

Grades 9-11

Related Recommendation

Solving Boat Speed and River Current Problems Using Algebra

Calculate Boat Speed and Current Rate: Upstream and Downstream Problem

Solve Speed of Boat in Still Water Using Simultaneous Equations

Find the Speed of a Boat in Still Water and the Current: Solving with Systems of Equations

Calculate River Speed Problem: Boat and Current Relations