Question
A train passed two bridges of lengths 800 m and
400 m in 100 seconds and 60 seconds respectively. The length of the train is?Solution
Let the length of the train be x. 
According to the question, x + 800/ 100 = 
x + 400 / 60 60x + 48000 = 100x + 40000 48000 - 40000 = 100x - 60x 8000 = 40x x = 200 m Let the length of the train be According to the question, + 800/ 100 = + 400 / 60 
60 + 48000 = 100 + 40000 48000 - 40000 = 100 - 60 8000 = 40 
= 200 m
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