Two trains are moving in the same direction with speeds of 15 km/h and 21 km/h, respectively. What is the speed of trains in respect of each other?

Options

A. 26 km/h
B. 15 km/h
C. 6 km/h
D. 24 km/h

Answer

To find the speed of the two trains with respect to each other, we can follow these steps:

### Step 1: Identify the speeds of the trains
- Train A is moving at a speed of 15 km/h.
- Train B is moving at a speed of 21 km/h.

### Step 2: Determine the relative speed
When two objects are moving in the same direction, the relative speed is calculated by subtracting the speed of the slower object from the speed of the faster object.

### Step 3: Calculate the relative speed
Relative speed = Speed of Train B - Speed of Train A
Relative speed = 21 km/h - 15 km/h
Relative speed = 6 km/h

### Conclusion
The speed of the trains with respect to each other is 6 km/h.

---