A rikhshaw covered 2 km/hr and return back at a speed of 11 km/hr find the average speed of the rickshaw
total distance: 2
total time: 1/2 + 1/11 = 13/22
avg speed is thus 2*13/22 = 13/11
or, viewed as a classic work problem, the avg speed is
2/x = 1/2 + 1/11