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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.
