Question

Rakesh walking at the speed of 8 km/h crosses a bridge in 30 minutes. What is the length of the bridge in kilometre? 
1. 5 km
2. 2 km
3. 3 km
4. 4 km

Answer 1

Correct Answer - Option 4 : 4 km

Given:

Speed of Rakesh = 8 km/h

Time taken by Rakesh to cross the bridge = 30 minutes = (1/2) hours

Formula used:

Speed = Distance/Time

Calculations:

Let the length of the bridge be l

⇒ 8 = l/(1/2)

⇒ l = 8 × (1/2)

⇒ l = 4 km

∴ The length of the bridge is 4 km