A man goes from A to B at a speed of 60 kmph and comes back to A at a speed of 40 kmph. Find his average speed for the entire journey? Pick one:
A) 49 kmph
B) 58 kmph
C) 44 kmph
D) 47 kmph
E) 48 kmph

Rationale: "distance from a and b be ' d ' average speed = total distance / total time average speed = ( 2 d ) / [ ( d / 60 ) + ( d / 40 ] = ( 2 d ) / [ 5 d / 120 ) = > 48 kmph . answer : e"
Answer: E