A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.

A train moves with a constant speed of 36 km h^(-1) in the first 10 minutes , with another constant speed of 45km h^(-1) in the bext 10 minnutes and then with an acceleration of 5 ms^(-2) in the last 10 minutes. Calculate the average speed of last 10 minutes . Calculate the average speed of the train for this journey and the total distance travelled.

A cyclist moves with a speed of 30km/hr in the first 10 minutes, with speed of 15km/hr in the next 20 minute and with a speed of 40km/hr in the last 15 minutes Calculate the average speed of the cyclist.

A train travels with a speed of 20 m/s in the first 10 minutes, goes 8.5 km in the next 10 minutes, 11 km in the next 10,8.5 km in the next 10 and 6 km in the next 10 minutes. What is the average speed of the train in kilometer per hour for the journey described?

A car covers the first half of the distance between two places at a speed of 40 kmh^(-1) and the second half at 60 kmh^(-1) the next 15 minutes,and then with a speed of 60 kmh ^(-1) .what is the average speed of the car ?

A train travels the first 15 km at a uniform speed of 30 km/h, the next 75 km at a uniform speed of 50 km/h, and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

A train travels some distance with a speed of 30 km//h and returns with a speed of 45 km//h . Calculate the average speed of the train.