Multiple choice

If a taxi at 40 km/hr takes 25 minutes to travel a certain distance, then by how much should it increase its speed (in km/hr) to travel the same distance in 20 minutes?

  1. 50

  2. 5

  3. 25

  4. 10
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Distance = speed * time = 40 * (25/60) = 50/3 km. To travel this in 20 minutes (1/3 hour), the new speed must be (50/3) / (1/3) = 50 km/hr. The increase required is 50 - 40 = 10 km/hr.

AI explanation

Using the distance formula, the distance traveled is 40 km/h multiplied by 25/60 hours, which equals 16.66 km. To cover this same distance in 20 minutes (which is 20/60 or 1/3 of an hour), the required speed is 16.66 km divided by 1/3 hours, yielding 50 km/hr. Therefore, the taxi needs to increase its speed by 50 - 40 = 10 km/hr. The required increase in speed is 10 km/hr.

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