arithmetic - two trains start from p and q respectively and travel towards each other at a speed of 50 kmhr and 40 kmhr respectively by the time they meet the first train has traveled 100 km more than the second the distance between p and q is - skillgun

At the time of meeting, let the distance traveled by b the second train be x km. Then,
distance covered by the first train is (x + 100) km
=> x/40 = (x+100)/50
=> 50x = 40x 4000
=> x = 400.
So, distance between P and Q = (x+x+100) km
= 900 km.