Multiple choice

A train covers a certain distance in 50 minutes at a speed of 48 km/hr. What should be the speed of the train to cover the same distance in 40 minutes?

  1. 80 km/hr

  2. 55 km/hr

  3. 70 km/hr

  4. 60 km/hr

  5. 50 km/hr
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The distance is speed * time = 48 km/hr * (50/60) hr = 40 km. To cover 40 km in 40 minutes (40/60 hr), the speed must be 40 / (40/60) = 60 km/hr.

AI explanation

Using the formula that speed and time are inversely proportional when distance is constant, the ratio of times is 40 minutes to 50 minutes, which is 4 to 5. Therefore, the required speed is 5/4 of the original speed, making the calculation (5/4) multiplied by 48 km/hr. This results in a new speed of 60 km/hr.

Keep practicing — related questions