Two trains start at same time from A and B towards each other and after crossing they take a and b sec in reaching B and A then ratio of speeds of A and B.

Two persons A and B start at the same time in opposite directions from two points then after passing each other they complete the journey in a and b hours the ratio of speeds of A and B.

Distance between two stations A and B is 690 km. Two cars start simultaneously from A and B towards each other, and the distance between them after 6 hours is 30 km. If the speed of one car is less than the other by 10 km/hr, find the speed of each car.

Two trains started at the same time , one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other , the ratio of the speeds of the two trains was

Two trains P and Q whose front ends are 539 km apart. They start at the same time towards each other and cross each other after 200 minutes. The ratio of length of these trains is 3 ∶ 2 and their speeds are 90 km/hr and 72 km/hr. Find the difference of the length of these two trains.