A 100 metre long train moving in a uniform speed of 20 m/sec crosses a
bridge of length 1 km. The time taken by the train to cross the bridge is

To calculate the time taken by a 100-meter-long train moving at 20 m/s to cross a bridge of 1 km (1000 meters), we need to consider the total distance the train has to travel.

The total distance is the length of the train plus the length of the bridge:

\[
\text{Total distance} = \text{Length of train} + \text{Length of bridge} = 100\, \text{meters} + 1000\, \text{meters} = 1100\, \text{meters}
\]

The speed of the train is given as 20 m/s. Using the formula for time:

\[
\text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{1100}{20} = 55\, \text{seconds}
\]

Thus, the time taken by the train to cross the bridge is **55 seconds**.

Would you like further details or have any questions? Here are some related questions to deepen your understanding:

1. How would the time change if the train's speed were doubled?
2. What is the time taken to cross the bridge if the train were twice as long?
3. How is the time affected if the bridge were 2 km long?
4. What formula represents the general case for time taken to cross a bridge with a given speed and lengths?
5. How can we convert the time taken into minutes?

**Tip:** Always remember to add the length of both the train and the bridge when calculating the total distance for such problems!

A 100-metre-long train moving in a uniform speed of 20 m/sec crosses a bridge of length 1 km. The time taken by the train to cross the bridge is

Discover how to calculate the time taken by a 100-meter-long train moving at 20 m/s to cross a 1 km long bridge. This problem teaches key concepts like distance, speed, and time calculations. Suitable for students in Grades 6-8.

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