Mohan’s home is 400 m North of Radha’s home. Both started from their respective homes and moves 100 m towards the North. Mohan then turned left and moved 200 m and again turned left and moved 350 m straight and reached his school. Radha then turned right and moved 350 m straight and then turned left and moved 50 m and reached her school. What is the shortest distance between their schools?