A person covers 1/4 of his journey at the speed of 25 km/h, 1/2 of the journey at 40km/h and the remaining at the speed of 50 km/h. Find his average speed per hour for the whole journey (in km/h).
1
\(36\frac{4}{11}\)
2
\(34\frac{4}{11}\)
3
\(34\frac{6}{11}\)
4
\(36\frac{6}{11}\)