Question 1
A 270 meters long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train ?
Solution
Relative speed = (120 + 80) kmph (or) 200 kmph, Relative time = 9 seconds, Relative distance = (270 + x) meters
Let x be the length of other train.
We know that,
Distance = speed x time
270 + x = 200 x $$\frac{5}{18}$$ x 9
270 + x = 100 x 5
x = 500 - 270 (or) 230 meters.
Hence, option D is the correct answer.
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