Q. A and B are two stations 500 km apart. A train starts from A and moves towards B at 20 km/hr. Another train starts from B at the same time towards A at 30 km/hr. How for from A will they cross each other?
TLT: Speed is prop to distance
Speed Ratio=20:30=2:3
So, Distance Ratio=2:3
:(2+3)=500, i.e. :1=100
A’s distance(:2)=2X100=200
B’s distance(:3)=3X100=300
So, trains will meet 200km from A