Karl’s house is 150 meters from the bus stop, and 350 meters from the library. If Karl is at the bus stop and decides to walk to the library, how far will he have to travel?
It depends, in a 2 dimensional space it could either be 200 meters or 500 meters, i guess that is what you are asking.
If the bus stop is 150 metres from there to his house, and library is 350 metres from there to his house, subtract the Metres from the bus stop and library:
350m - 150m = 200m
He will walk 200 metres from the bus stop to the library.