Multiple choice

A car has to cover the distance $60\ km$. If half of the total time it travels with speed $80\ km/h$ and in rest half time its speed becomes $40\ km/h$, the average speed of car will be:

  1. $60\ km/h$
  2. $80\ km/h$
  3. $120\ km/h$
  4. $180\ km/h$
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A Correct answer
Explanation

Average speed is total distance divided by total time. Let total time be T. Distance covered in first half time is 80 * (T/2) = 40T. Distance in second half is 40 * (T/2) = 20T. Total distance = 60T = 60 km, so T = 1 hour. Average speed = 60 km / 1 hour = 60 km/h.

AI explanation

Because the car travels for two equal time intervals, the average speed is the simple arithmetic mean of the two speeds. You calculate this as (80 + 40) / 2, which equals 60 km/h.

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