Multiple choice

A train of length 110 m is moving at a uniform speed of 132 km/hr. The time required to cross a bridge of length 165 m is

  1. 6.5 seconds

  2. 7 seconds

  3. 7.5 seconds

  4. 8.5 seconds
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 110 + 165 = 275 m. Speed = 132 km/hr = 132 * (5/18) m/s = 110/3 m/s. Time = Distance / Speed = 275 / (110/3) = (275 * 3) / 110 = 825 / 110 = 7.5 seconds.

AI explanation

Using the unit conversion, the train's speed of 132 km/hr equals 132 multiplied by (5/18), which equals 110/3 m/s. The total distance to cross the bridge is the sum of the train's length and the bridge's length, 110 plus 165 equals 275 m. The required time is 275 divided by (110/3) equals 7.5 seconds.

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