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.**