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Question

Two buses are moving in opposite directions with speed of 30 km/hr and 45 km/hr respectively. Their lengths are 0.55 km and 0.45 km respectively. In what time will the slower bus cross the faster bus?


  1. 48 seconds

  2. 36 seconds

  3. 60 seconds

  4. 72 seconds

  5. None of these


Solution

The correct option is A

48 seconds


Relative speed = 30 + 45 = 75 km/hr (Since both buses are moving in opposite directions)

Total distance = 0.55 + 0.45 = 1 km

Time = 1/75 hr = 3600/75 seconds = 1200/25 = 240/5 = 48 seconds

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