# A man riding on a bicycle at a speed of 15 km/h crosses a bridge in 5 min. Find the length of the bridge.

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A man riding on a bicycle at a speed of 15 km/h crosses a bridge in 5 min. Find the length of the bridge.

1. 1 km
2. 2 km
3. 2(1/2) km
4. 1(1/4) km

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Correct Answer - Option 4 : 1(1/4) km

Given:

A man riding on a bicycle at a speed of 15 km/h crosses a bridge in 5 min.

Formula used:

Distance = speed × time

1 min = (1/60) hours

Calculation:

Speed = 15 km/h

Time = 5 min

Time in hours

⇒ 5 × 1/60

⇒ 1/12 hours

According to the question,

Distance = speed × time

⇒ 15 × 1/12

⇒ 1$\frac{1}{4 }$ km

∴ The length of bridge is 1$\frac{1}{4 }$ km.