A man goes from a place A to B at a speed of 12 km /hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey is

A man goes from a place A to B at a speed of 12 km /hr and returns from B to A at a speed of 18 km/hr. The average speed for the whole journey is
1). $14\frac{2}{5}$ km/hr
2). 15 km/hr
3). $15\frac{1}{2}$ km/hr
4). 16 km/hr

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