A & B are two towns. A person covers the distance from A to B on cycle at 17kmph and returns to A by a boat running at a uniform speed of 8kmph. His average speed for the whole journey is Select the correct option
A) 12.5 km/h  B) 12.33 km/h  C) 10.75 km/h  D) 10.88 km/h  E) 10.78 km/h
When same distance is covered with different speeds, then the average speed = 2xy / x+y = 10.88kmph   Answer : 10.88 km/h.
<result>D</result>
A & B are two towns. A person covers the distance from A to B on cycle at 17kmph and returns to A by a boat running at a uniform speed of 8kmph. His average speed for the whole journey is