A man goes from A to B at a speed of 20 kmph and comes back to A at a speed of 30 kmph. Find his average speed for the entire journey?  Choose the correct answer:
A) 30 kmph	B) 38 kmph	C) 24 kmph	D) 34 kmph	E) 04 kmph
Distance from A and B be 'd'   Average Speed = total distance/total time   Average Speed = (2d)/[(d/20) + (d/30)]   = (2d)/[5d/60) =&gt; 34 kmph.   ANSWER:34 kmph
<result>D</result>
A man goes from A to B at a speed of 20 kmph and comes back to A at a speed of 30 kmph. Find his average speed for the entire journey?