A train travels 58 kilometers in 4 hours, and then 80 kilometers in 4 hours. What is its average speed?

Average speed =

(total distance covered) / (time to cover the distance).

Total distance covered = (58km + 80km) = 138 km

Time to cover the distance = (4hr + 4hr) = 8 hours

Average speed = 138km / 8hr = 17.25 km/hour.

(That's less than 11 mph. You could bike there faster!)