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A man riding on a bicycle at a speed of 21 km/h crosses a bridge in 6 minutes. Find the length of the bridge?

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RPF Constable 2024 Official Paper (Held On 02 Mar, 2025 Shift 2)
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  1. 2.1 km
  2. 6.1 km
  3. 5.1 km
  4. 4.5 km

Answer (Detailed Solution Below)

Option 1 : 2.1 km
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Detailed Solution

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Given:

Speed of the man (S) = 21 km/h

Time taken to cross the bridge (T) = 6 minutes

Formula used:

Distance (D) = Speed (S) × Time (T)

Calculation:

Convert time from minutes to hours:

6 minutes = 6/60 hours = 0.1 hours

Distance (D) = 21 km/h × 0.1 hours

⇒ D = 2.1 km

∴ The correct answer is option 1.

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