On a `120 km` track , a train travels the first `30 km` at a uniform speed of ` 30 km//h`. How fast must the train travel the next `90 km` so as to average `60 km//h` for the entire trip?

On a 60 km track, a train travels the first 30 km with a uniform speed of 30 kmh^(-1) . How fast must the train travel the next 30 km so as to average 40 kmh^(-1) for the entire trip ?

On a 100km track, a train travels the first 30 km at a uniform speed of 30 kmh^(-1) . How fast must the train travel the next 70 km so as to averge the next 40km h^(-1) for entire trip.

On a 100km track, a train travels the first 30 km at a uniform speed of 30 kmh^(-1) . How fast must the train travel the next 70 km so as to averge the next 40km h^(-1) for entire trip.

On a 100 km track, a train mvoes the first 50 km with a uniform speed of 50 km h^(-10 How fast must the train travel the next 50 km so as to have average speed 60 km h^(-1) for the entire trip ?

On a 80 km track, a train travels 40 km with a uniform speed of 30 km h^(-1) . How fast must the train travel the next 40 km h^(-1) as to have average speed 40 km h^(-1) for the entire trip?

On a 120km road, a car travels the first 30km with at a uniform speed of 30km/h. How fast must the car travel for the rest of track so as to have an average speed of 60km/h for the entire journey?

On a 60 km straight road, a bus travels the first 30km with a uniform speed of 30kmh^(-1) . How fast must the bus travel the next 30 km so as to have average speed of 40kmh^(-1) for the entire tirp?

The distance between two statios is 200km.A train travels goes the first 100km at a speed of 10km/hr. How fast should the train travel the next 100km so as to average 70km/hr for the whole journey.