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Doctors Medicines MCQs Q&A

  1. 205
  2. 250
  3. 220
  4. 200
  5. 288
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1 Answers

Option 4 : 200

Let the length of the train be x m

⇒ Distance travelled by train when it pass platform A = (200 + x) m

⇒ Distance travelled by train when it pass platform B = (100 + x) m

⇒ Speed of the train when it pass platform A = (200 + x)/20

⇒ Speed of the train when it pass platform B = (100 + x)/15

∵ Speed of train remain same

∴ (200 + x)/20 = (100 + x)/15

⇒ 15(200 + x) = 20(100 + x)

⇒ 3000 + 15x = 2000 + 20x

⇒ x = 1000/5 = 200

∴ The length of the train is 200 m
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