Train A and Train B are travelling away from each other at speeds if 50mph and 70mph respectively. What is the relative speed of two trains ?
I don’t know why you have added the speeds. Can you please explain this .
I’m confused when to add and subtract the speeds
If two objects move in same direction at different speeds

If speed of 1st object = x km/hr and

Speed of 2nd object = y km/hr

Therefore, their relative speed = (x – y) km/hr [x > y]
If two objects move in opposite direction at different speeds

If speed of 1st object = x km/hr and

Speed of 2nd object = y km/hr

Therefore, their relative speed = (x + y) km/hr
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