Train A has left 1hr Prior. This means with the speed mentioned, it has already traveled 15m in that hour leaving us with a distance of 190-15=175

I just had a doubt why are considering 175 = 25x time

I understand that 25 is the added speeds

but we usually take total distance when we add the added speeds right

This is super confusing

@Adnan

The reason we subtract in this case is that A is moving *towards* B (not *away* from B), which means that the distance reduce. In other words, they are coming closer.

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So we consider the reduced distance in this case Cool