A person travels a certain distance at 3 km/hr and reaches 15 min late. If he travels at 4 km/hr, he reaches 15 min earlier. The distance he has to travel is

A man cycles with a speed of 10 km/h and reaches his offices at 1 pm. However, when he cycles with a speed of 15 km/h, he reaches his office at 11 am. At what speed should he cycle, so that he reaches his office at 12 noon?

Two cars A and B start simultaneously from a certain place at the speed of 30 km/h and 45 km/h, respectively. The car B reaches the destination 2 h earlier than A. what is the distance between the starting point and destination?

The first one-third part of a 75 km long journey took half as long as the time taken to complete the rest of the trip. If the last two-third part of the journey took ‘h’ hrs, then the average speed of the whole trip was: