A person covered one-fourth of the total distance at 17 kmph and remaining distance at 24 kmph. What is the average speed for the total distance?  Choices:
A) 21 (1/8) B) 21 (19/25) C) 21 (8/25) D) 29 (1/25) E) 21 (4/25)
Let the total distance be x km   total time taken = (x/4)/17 + (3x/4)/24 = 25x/544   Average speed = x/(25x/544) = = 21 (19/25)kmph.   Answer: 21 (19/25)
<result>B</result>
A person covered one-fourth of the total distance at 17 kmph and remaining distance at 24 kmph. What is the average speed for the total distance?