Spandy travels from X to Y at a speed od 40 kmph and returns by increasing his speed by 50%. What is his average speed for the whole journey?	Choose the correct choice from the following answers:	A) 36 kmph	B) 45 kmph	C) 48 kmps	D) 45 kmps	E) 42 kmps
Explanation :   Let the distance between X and Y be x km.   Time taken from X to Y @ 40 km/h=(x/40)hours   Time taken from Y to X @ 60 km/h=(x/60)hours   Average speed=2x/((x/40)+(x/60))= 48 km/h.   Answer : 48 kmps
<result>C</result>
Spandy travels from X to Y at a speed od 40 kmph and returns by increasing his speed by 50%. What is his average speed for the whole journey?