The speeds of four cars are 2u, 3u, 4u and xu and the time taken by them to cover the same distance is xt, 4t, 3t and 2t respectively, where x, u, t are real numbers. What is the value of x?

The speeds of three cars are in the ratio 2:3:4. The ratio between the time taken by these cars to travel the same distance is -

Two trains A and B started from stations P and Q respectively towards each other. Train A started at 7 p.m. at a speed of 60 km/hr and train B started at 4 a.m. (next day) at a speed of 90 km/hr. The…

Two trains A and B started from stations P and Q respectively towards each other. Train A started at 7 p.m. at a speed of 60 km/hr and train B started at 4 a.m. (next day) at a speed of 90 km/hr. The…

If 30% of the distance is covered by A at 20 km/h and the remaining distance is covered at 70 km/h, then the average speed of A is :

The time taken by a train to cross a man travelling in another train is 10 seconds, when the other train is travelling ni the opposite direction. However, it takes 20 seconds, if both the trains are…