Multiple choice general knowledge math & puzzles

Two trains are moving in opposite directions @ 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. 36

  2. 45

  3. 48

  4. 49
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For opposite directions, add speeds: 60 + 90 = 150 km/hr. Convert to m/s: 150 × 5/18 = 41.67 m/s. Convert lengths to meters: 1.10 + 0.9 = 2.0 km = 2000 m. Time = 2000/41.67 = 48 seconds.

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