Murali travelled from city A to city B at a speed of 40 kmph and from city B to city C at 60 kmph. What is the average speed of Murali from A to C given that the ratio of distances between A to B and B to C is 8 : 4?  Choose one:
A) 16
B) 45
C) 277
D) 92
E) 11
Let the distances between city A to B and B to C be 8x km and 4x km respectively.   Total time taken to cover from A to C   = (8x)/40 + (4x)/60 = (4x + 8x)/120 = 32x/120 = 4x/15 Average speed = (8*x + 4x)/(4x/15) = 45 kmph.   Answer:45
<result>B</result>
Murali travelled from city A to city B at a speed of 40 kmph and from city B to city C at 60 kmph. What is the average speed of Murali from A to C given that the ratio of distances between A to B and B to C is 8 : 4?