Multiple choice

A 180-meter long train crosses another 270-meter long train running in the opposite direction in 10.8 seconds. If the speed of the first train is 60 kmph, what is the speed of the second train in kmph?

  1. 80

  2. 90

  3. 150

  4. Cannot be determined

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = Total distance / Time = (180 + 270) / 10.8 = 450 / 10.8 = 41.66 m/s. Convert to kmph: 41.66 * 18/5 = 150 kmph. Since they are in opposite directions, relative speed = S1 + S2. 150 = 60 + S2, so S2 = 90 kmph.

AI explanation

When two trains move in opposite directions, their relative speed is the sum of their individual speeds. The total distance covered is 180 m + 270 m = 450 m, and taking 10.8 seconds means their relative speed is 450 / 10.8 = 41.66 m/s. Converting this to kmph gives 41.66 * (18/5) = 150 kmph, and subtracting the first train's speed of 60 kmph gives the second train's speed as 90 kmph.

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