Question 111
Two trains running in opposite directions on parallel tracks, at speeds of 42 km/h and 57 km/h, take 18 seconds to cross each other. If the length of one train is 270 m,then the length of the other train is:
Solution
let second train length = $$x$$ meter
Both trains relative speed = 42 + 57 = 99 km/hr
change into m/s = $$99 \dfrac {5}{18} m/ s $$
given t (time taken) = 18 second
so according to question $$ 270 +x = 99 \times \dfrac{5}{18}\times 18 $$
$$\Rightarrow 270 + x = 495 $$
$$\Rightarrow x = 495 - 270 = 225 $$ meter Ans
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