Multiple choice

A train crosses a 122 m. long platform in 17 seconds and crosses a 210 m. long bridge in 25 seconds. What is the speed of the train in (m./s)?

  1. 19 m/sec.

  2. 17 m/sec.

  3. 13 m/sec.

  4. 11 m/sec.

  5. 23 m/sec.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let L be train length, v be speed. Platform case: L+122 = 17v. Bridge case: L+210 = 25v. Subtract first from second: (L+210) - (L+122) = 25v - 17v, so 88 = 8v, giving v = 11 m/s. Option D is correct.

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