Multiple choice

A man can walk uphill at the rate of $2.5$ kmph and down-hill at the rate of $3.25$ kmph. If the total time required to walk a certain distance up the hill and return to the starting position is $4$ hr $36$ min, what is the distance he walked up the hill?

  1. $3.5$ km
  2. $4.5$ km
  3. $5.5$ km
  4. $6.5$ km
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let d be the distance. Time up = d/2.5. Time down = d/3.25. Total time = 4.6 hours. d(1/2.5 + 1/3.25) = 4.6. d(0.4 + 0.3077) = 4.6. d(0.7077) = 4.6. d = 6.5 km.