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 choice from the following.
A) 19 kmph  B) 24 kmph  C) 17 kmph  D) 12 kmph  E) 16 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; 24 kmph.   Answer:24 kmph
<result>B</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?