If the speed of a swimmer in still water is 9 km/h. Find the down stream speed of the swimmer,whenthe river is flowing with the speed of 6 km/h.

Options

A. 15 km/h
B. 18 km/h
C. 3 km/h
D. 12 km/h

Answer

To solve the problem of finding the downstream speed of a swimmer when the speed of the swimmer in still water is 9 km/h and the river is flowing at 6 km/h, we can follow these steps:

### Step 1: Identify the speeds
- Speed of the swimmer in still water = 9 km/h
- Speed of the river (stream) = 6 km/h

### Step 2: Understand the concept of downstream speed
- The downstream speed of the swimmer is the combined speed of the swimmer and the river. When moving downstream, the speed of the river adds to the speed of the swimmer.

### Step 3: Calculate the downstream speed
- Downstream speed = Speed of swimmer + Speed of river
- Downstream speed = 9 km/h + 6 km/h

### Step 4: Perform the addition
- Downstream speed = 15 km/h

### Step 5: State the final answer
- The downstream speed of the swimmer is 15 km/h.