Multiple choice general knowledge math & puzzles

If I drive half-way to the city at 30 km/hour, how fast do I have to go for the rest of the way to make the average speed for the entire journey of 60 km/hour?

  1. 90 Kmph

  2. 120 Kmph

  3. 60 Kmph

  4. Cannot make it to 60Kmph
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To average 60 km/h over the entire journey, you'd need to complete the whole trip in a specific time. If you've already taken time to cover half the distance at 30 km/h, it's mathematically impossible to reach an average of 60 km/h for the full distance - you would need infinite speed for the remaining half.

Keep practicing — related questions