A train travels a distance of 900 km in 6 hours and another 1200 km in 4 hours. What is the average speed of the train in the whole journey?
1
210 km/hr
2
400 km/hr
3
225 km/hr
4
350 km/hr
A train travels a distance of 900 km in 6 hours and another 1200 km in 4 hours. What is the average speed of the train in the whole journey?