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Two trains X and Y are travelling in the same direction. Their lengths are 850m and 950m respectively. They took 6 mins to cross each other. Find the speed of train X if the speed of train Y is 90 kmph ?
  • a)
    72 kmph
  • b)
    74 kmph
  • c)
    76 kmph
  • d)
    78 kmph
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Two trains X and Y are travelling in the same direction. Their lengths...
Let the speed of train X is x kmph
Relative speed = 90-x kmph (if train Y is faster than train X)
Speed = distance/time = (850+950)/(6*60) = 1800/360 = 5 m/s = 5*(18/5) = 18 kmph
90 - x = 18 kmph
x = 90 - 18 = 72 kmph
So the answer is option A.
Case 2 :(If train Y is slower than train X)
x - 90 = 18, then x = 90 + 18 = 108 kmph
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Two trains X and Y are travelling in the same direction. Their lengths are 850m and 950m respectively. They took 6 mins to cross each other. Find the speed of train X if the speed of train Y is 90 kmph ?a)72 kmphb)74 kmphc)76 kmphd)78 kmphCorrect answer is option 'A'. Can you explain this answer?
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