 A 240 metre long train crosses a platform in 20
seconds. What is the speed of the train ?
(1) 10 metres/sec.
(2) 12 metres/sec.
(3) 18 metres/sec. (4) Cannot be determined
(5) None of these

To calculate the speed of the train, we use the formula for speed:

\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
\]

In this case:
- The train is 240 meters long.
- The time it takes to cross the platform is 20 seconds.

Since the train crosses the entire platform in 20 seconds, we can assume it travels its full length in that time. So the distance covered is 240 meters.

Now, using the formula:

\[
\text{Speed} = \frac{240 \, \text{meters}}{20 \, \text{seconds}} = 12 \, \text{meters/second}
\]

Thus, the speed of the train is **12 meters per second**.

The correct option is (2) **12 metres/sec**.

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Do you need more details, or have any questions?

Here are 5 related questions:
1. How would the speed change if the train were 300 meters long and took the same time to cross the platform?
2. What is the speed in kilometers per hour?
3. How long would it take for the same train to cross a bridge that is 500 meters long?
4. If the train's speed increases by 50%, what would its new speed be in meters per second?
5. How much time would the train take to cross a 360-meter platform at the same speed?

**Tip:** To convert meters per second to kilometers per hour, multiply by 3.6.

A 240 metre long train crosses a platform in 20 seconds. What is the speed of the train? (1) 10 metres/sec. (2) 12 metres/sec. (3) 18 metres/sec. (4) Cannot be determined (5) None of these

Learn how to calculate the speed of a 240-meter-long train that crosses a platform in 20 seconds. This problem covers key concepts in speed, distance, and time, and uses the formula Speed = Distance / Time. Suitable for students in Grades 6-8.

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