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## Explanation

A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train will be calculated by the formula mentioned here under as;

Length = speed x time ______ (i)

Time is given but speed is not given.

So, to calculate the speed, first we will convert 12 km into meters and this becomes 12000 meter and time 10 minutes become 600 seconds.

speed = distance/time

By substituting the respective values in this expression, speed would be determined and then length, after applying the same procedure in equation (i).

## To Find

Length = ?

## Solution

Given distance = 12 km = 12 x 1000 = 12,000 m

Time = 10 minutes = 10 x 60 = 600 sec

Speed = 12,000/600 = 20 m/sec

Time required to pass a telegraph post = 6 sec

Now,

Length = speed x time

Length = 20 x 6

**Length = 120 meter answer**

### Conclusion

A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train will be **120 meter**.