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Two men are sitting in their cars at the two opposite ends of a 315 metres long bridge. If they start driving towards each other at a speed of 36 km/hr and 45 km/hr respectively, then in how much time will they meet each other?
  • a)
    12 seconds
  • b)
    18 seconds
  • c)
    14 seconds
  • d)
    16 seconds
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Two men are sitting in their cars at the two opposite ends of a 315 me...
Approach:
To find the time taken for the two cars to meet each other, we can use the concept of relative speed. We will calculate the relative speed of the two cars and then divide the total distance by this relative speed to find the time taken for them to meet.

Relative Speed:
- Car 1 speed = 36 km/hr
- Car 2 speed = 45 km/hr
- Relative speed = Speed of Car 1 + Speed of Car 2
- Relative speed = 36 km/hr + 45 km/hr = 81 km/hr

Calculating Time:
- Convert the relative speed from km/hr to m/s (1 km/hr = 5/18 m/s)
- Relative speed = 81 km/hr * 5/18 = 22.5 m/s
- Distance = 315 meters
- Time taken = Distance / Relative speed
- Time taken = 315 m / 22.5 m/s = 14 seconds
Therefore, the two cars will meet each other in 14 seconds. Hence, the correct answer is option 'c'.
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Community Answer
Two men are sitting in their cars at the two opposite ends of a 315 me...
36 km/hr = 36 × 5/18 m/sec = 10 m/sec
45 km/hr = 45 × 5/18 m/sec = 12.5 m/sec
So, their relative speed = 10 + 12.5 = 22.5 m/sec
Time taken by them to meet each other = Length of the bridge / Relative speed = 315/22.5 = 14 seconds
Hence, option (c) is correct.
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Two men are sitting in their cars at the two opposite ends of a 315 metres long bridge. If they start driving towards each other at a speed of 36 km/hr and 45 km/hr respectively, then in how much time will they meet each other?a)12 secondsb)18 secondsc)14 secondsd)16 secondsCorrect answer is option 'C'. Can you explain this answer?
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