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Two trains are moving in opposite directions at the rate of 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in…

Question and options

Two trains are moving in opposite directions at the rate of 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is
  1. 34
  2. 44
  3. 48
  4. 50

Answer and explanation

Correct answer: C - 48
Opposite directions: relative speed = 60 + 90 = 150 km/h =1253= \frac{125}{3} m/s. Distance = 1.10 + 0.9 = 2 km = 2000 m. Time =2000÷1253=48= 2000 \div \frac{125}{3} = 48 s.

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