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:

A. 24

B. 25

C. 12.5

D. 12

Answer: Option B

Solution(By Examveda Team)

Let length of engine = $$x$$ m
According to question
$$\eqalign{ & \frac{{x + 400}}{{100}} = \frac{{x + 235}}{{60}} \cr & \Rightarrow 6x + 2400 = 10x + 2350 \cr & \Rightarrow 4x = 50 \cr & \Rightarrow 2x = 25{\text{ m}} \cr} $$