A train takes 1 hour to go from one station to the other. It travels at a speed of 30kmh-1 for first half hour and at a speed of 50 kmh-1 for the next half hour. The average speed of the train is:
Correct answer: B. 40 kmh-1
- A. 45 kmh-1
- B. 40 kmh-1
- C. 35 kmh-1
- D. 30 kmh-1
Explanation
To find the average speed, we first calculate the total distance. The train travels for the first half hour at 30 kmh-1, covering a distance of 15 km. Then, it travels for the next half hour at 50 kmh-1, covering a distance of 25 km. Adding these, the total distance is 40 km. Since the total time is 1 hour, the average speed is calculated as total distance divided by total time: 40 km / 1 hour = 40 kmh-1. The other options are incorrect as they either imply a different total distance or time that does not match the given data.
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