Multiple choice

A cart travels a distance d on a straight road in two hours and then returns to the starting point in next three hours. Its average speed is:

  1. $\dfrac{d}{5}$
  2. $\dfrac{2d}{5}$
  3. $\dfrac{d}{2} + \dfrac{d}{3}$

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average speed = Total distance / Total time. Total distance = d + d = 2d. Total time = 2 + 3 = 5 hours. Average speed = 2d/5.

AI explanation

Average speed is calculated as the total distance traveled divided by the total time taken. The cart travels a distance d forward and then a distance d backward, making the total distance equal to 2d. Since the total time taken for the entire journey is 2 hours plus 3 hours, which equals 5 hours, the average speed is 2d divided by 5.

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