Find the time taken by a train 100 m long traveling at a speed of 72 kmph to cross a bridge 60 m long.We

To find the time taken by the train to cross the bridge, we need to follow these steps:

### Step 1: Convert speed into meters per second (m/s)
The train’s speed is given as 72 km/h. To convert it into meters per second, we use the formula:

\[
\text{Speed in m/s} = \frac{\text{Speed in km/h} \times 1000}{3600}
\]

\[
\text{Speed in m/s} = \frac{72 \times 1000}{3600} = 20 \, \text{m/s}
\]

### Step 2: Calculate the total distance to be covered
The train needs to cross its own length and the length of the bridge. The total distance is:

\[
\text{Total distance} = \text{Length of the train} + \text{Length of the bridge}
\]

\[
\text{Total distance} = 100 \, \text{m} + 60 \, \text{m} = 160 \, \text{m}
\]

### Step 3: Use the formula for time
The time taken to cover a certain distance at a given speed is calculated by:

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

\[
\text{Time} = \frac{160 \, \text{m}}{20 \, \text{m/s}} = 8 \, \text{seconds}
\]

### Final Answer:
The train will take 8 seconds to cross the bridge.

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Do you want more details on this calculation?  
Here are 5 related questions you might find interesting:

1. How long will it take for a train to cross a tunnel if its length is double that of the train?
2. What is the time taken by the same train to cross a 150-meter-long platform?
3. How does the time change if the train's speed increases to 90 km/h?
4. If the train were 120 m long, how would the crossing time be affected?
5. How do factors like wind resistance and incline affect a train's crossing time?

**Tip:** When converting km/h to m/s, divide the speed by 3.6 to make the conversion quicker.

Find the time taken by a train 100 m long traveling at a speed of 72 kmph to cross a bridge 60 m long.

Find the time taken for a 100-meter-long train traveling at 72 km/h to cross a 60-meter-long bridge. Learn to convert speed from km/h to m/s and calculate the time using distance and speed. Suitable for Grades 6-8 students.

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