A boat can travel at 12 km/h in still water. If it is going downstream in a rive
Practice Questions
Q1
A boat can travel at 12 km/h in still water. If it is going downstream in a river flowing at 3 km/h, what is the speed of the boat relative to the riverbank?
9 km/h
12 km/h
15 km/h
3 km/h
Questions & Step-by-Step Solutions
A boat can travel at 12 km/h in still water. If it is going downstream in a river flowing at 3 km/h, what is the speed of the boat relative to the riverbank?
Step 1: Understand that the boat's speed in still water is 12 km/h.
Step 2: Know that the river is flowing at 3 km/h downstream.
Step 3: Realize that when the boat is going downstream, its speed increases because it is moving with the flow of the river.
Step 4: To find the total speed of the boat downstream, add the speed of the boat to the speed of the river.
Step 5: Calculate the total speed: 12 km/h (boat) + 3 km/h (river) = 15 km/h.
Step 6: Conclude that the speed of the boat relative to the riverbank is 15 km/h.
Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
Vector Addition – Applying the concept of adding speeds in the same direction to find the resultant speed.
