Multiple choice

If a boy increases his speed by 5 km./hr. reaches 10 min early and if he decrease his speed by 3 km./hr. he reaches 10 min late. Find the distance between starting point and destination.

  1. 5 km

  2. 8 km

  3. 9 km

  4. 10 km

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let original speed be v km/hr and distance be d km. Time = d/v. At v+5: d/(v+5) = d/v - 10/60. At v-3: d/(v-3) = d/v + 10/60. Solving these equations gives d = 10 km.

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