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A railway engine passes two bridges of lengths 400 m and 235 m in 100 seconds and 60 seconds, respectively. Twice the length of the railway engine (in m) is:
Answer & Solution
Correct Answer:
Option
B
Let length of engine = $$x$$ m
According to question
$$\eqalign{ & \frac{{x + 400}}{{100}} = \frac{{x + 235}}{{60}} \cr & \Rightarrow 6x + 2400 = 10x + 2350 \cr & \Rightarrow 4x = 50 \cr & \Rightarrow 2x = 25{\text{ m}} \cr} $$
According to question
$$\eqalign{ & \frac{{x + 400}}{{100}} = \frac{{x + 235}}{{60}} \cr & \Rightarrow 6x + 2400 = 10x + 2350 \cr & \Rightarrow 4x = 50 \cr & \Rightarrow 2x = 25{\text{ m}} \cr} $$
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