Multiple choice

A train covers a certain distance in 50 minutes if it runs at an average speed of 48 km per hour. The speed at which the train must run to reduce the time of journey to 40 minutes will be

  1. 80 km/hr

  2. 75 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

Distance = Speed * Time. Distance = 48 km/hr * (50/60) hr = 40 km. To cover 40 km in 40 minutes (2/3 hr), the speed must be 40 / (2/3) = 60 km/hr.

AI explanation

Using the distance formula, the total distance covered is 48 km/h multiplied by 50/60 hours, which equals 40 km. To cover this same distance in 40 minutes (which is 40/60 or 2/3 of an hour), the required speed is 40 km divided by 2/3 hours. This calculation gives a required speed of 60 km/hr. The train must run at 60 km/hr.

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