Multiple choice

What is the respective ratio between times taken by a train 320m. long to cross a electric pole and a bridge of 75 m. long?

  1. 60 : 79

  2. 64 : 79

  3. 64 : 69

  4. 21 : 39

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

Time to cross pole = length/speed = 320/v. Time to cross bridge = (train length + bridge length)/speed = (320 + 75)/v = 395/v. Ratio = 320/v : 395/v = 320 : 395 = 64 : 79. Option B matches.

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