Two trains travelling along parallel tracks in the same direction do `50 (km) `/ `h` and `100 (km) `/` h` on average. The faster train starts 2 , hours later than the slower. After how many kilometres will the faster train catch up?

Two cars A and B travel from the same point and in the same direction. A is travelling at a speed of 30 k(m) / hour and B at a speed of 40 (km) / hour . After 4 hours, what is the distance between the cars? How far the cars would be if they travelled in opposite direction?

Rahim travelled 350 kilometres in a train and 150 kilometres in a bus. The average speed of the 'train was 70 km / h . The bus trip lasted 5 hours. What is the average speed of the entire trip?

Suppose two Cars start together in the same direction from the same place. The first goes with uniform speed of 10km//hr. The second goes at a speed of 8km//hr in the first hour and increases the speed by 1//2km each succeeding hour.Find the distance travelled by the first car in 'n' hours.

Suppose two Cars start together in the same direction from the same place. The first goes with uniform speed of 10km//hr. The second goes at a speed of 8km//hr in the first hour and increases the speed by 1//2km each succeeding hour.Find the distance travelled by the second car in 'n' hours.