Two buildings are located on one street at a distance of 250 metres from each other. There are 100 students living in the first building. There are 150 students living in the second building. Where should a bus stop be built so that the total distance that all residents of both buildings have to walk from their buildings to this bus stop would be the least possible?
(A) In front of the first building (B) 100 metres from the first building (C) 100 metres from the second building (D) In front of the second building (E) Anywhere between the buildings