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Explanation
The length of the bridge, which a train 130 meters long and travelling at 45 km/h can cross in 30 seconds will be determined according to the formula mentioned here under as;
Length = speed x time ________ (i)
Assuming the length of the bridge = b
Total length = b + 130
Speed will be converted to m/sec and time is also given (30 sec).
By substituting all the value in the equation (i); length becomes 245 meter.
To Find
Length of the bridge = ?
Solution
Given speed = 45 km/h
Speed in m/sec = (45 x 1000)/3600
Speed in m/sec = 12.5 m/sec
Let suppose
the length of bridge = b
so, total length = b + 130
Now,
length = speed x time
b + 130 = 12.5 x 30
b = 375 – 130
b = 245 meter answer
Conclusion
The length of the bridge will be 245 meter, if a train 130 meters long and travelling at 45 km/hr crosses the said bridge in 30 seconds.
