The speed of a bus from station A to B is 55 km/h. and while coming back from station B to A, the speed of the bus is 95 km/h. The average speed (in km/h) of the bus during the whole journey is:
1
\(72\frac{1}{3}\)
2
\(67\frac{1}{3}\)
3
\(62\frac{2}{3}\)
4
\(69\frac{2}{3}\)