Time and Distance Questions

If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?

The distance between two places A and B is 60 km. Two cars start at the same time from A and B, travelling at a speed of 35km/h and 25km/h, respectively. If the cars run in the same direction, then they will meet after ( in hours)

During morning walk, a man covers a distance of 3 km, 4 km, 3.5 km, 5 km and 4.5 km from Monday to Friday, respectively. How much distance should he cover on two more days, so that his average per week becomes 4 km per day?

The ratio of speeds of X and Y is 5:7. Y covers a distance of 420 km in 3 hours. What is the speed of X?

A and B are 15 kms apart and when travelling towards each other meet after half an hour whereas they meet two and a half hours later if they travel in the same direction. The faster of the two travels at the speed of

A man travelled a distance of 61 km. in 9 hours , partly by walking at speed of 4 km / hr and partly on bicycle at speed of 9 km / hr. The distance covered by walking is

A train has to cover a distance of 900 km in 25 hours. What should be its average speed in meters/second?

Gautam goes to office at a speed of 12 kmph and returns home at 10 kmph.His average speed is