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- A train 132 meter long passes a telegraph pole in 6 seconds
- A train 108 meter long moving at a speed of 50 km/h crosses

## Explanation

A train of length of 150 meter takes 40.5 seconds to cross a tunnel of length 300 meters; this statement shows, there are two lengths

- Length of the train = 150 meter
- Length of tunnel = 300 meter

Total length = 150 + 300 = 450 meter

As, time is also given so

speed = length/time ______ (i)

After placing the given values in equation (i) speed equals 40 km/h.

## To Find

Length of the train = ?

## Solution

Total length = 150 + 300 = 450 meter

Given time = 40.5 sec

Speed in m/sec = 450/40.5

Speed in m/sec = 11.11 m/sec answer

Speed in km/h = (11.11 x 3600)/1000

**Speed in km/h = 40 km/h answer**

### Conclusion

If a train of length of 150 meter take 40.5 seconds to cross a tunnel of length 300 meters. The speed of the train in km/h will be **40 km/h**.