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in Distance, Time and Speed by (238k points)
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If a boy runs at the speed of 20 km/hr and crosses a bridge in 15 minutes, then what is the length of the bridge?
1. 6000 metres 
2. 4500 metres 
3. 5500 metres 
4. 5000 metres 

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Correct Answer - Option 4 : 5000 metres 

Given:

The speed of the boy = 20 km\h

Formula used:

\(S\ =\ {D\over T}\)     (Where S = Speed, D = Distance, and T = Time)

Calculation:

Let us assume the length of the bridge be X

⇒ The speed of the boy = 20 × (5/18) = 100/18 m/s

⇒ The time = 15 minutes = 15 × 60 = 900 seconds

⇒ X = \({900}\ \times {100\over 18}\) = 5000 metres

∴ The required result will be 5000 metres.

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