A man walking at a speed of 5 km/h passes a bridge in 15 minutes. What is the length of the bridge (in metres)?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 1250
A man is a point compared with a bridge, so the distance he covers while crossing it is the length of the bridge: distance = speed × time, with the time in hours.
15 minutes \(=\frac{15}{60}=\frac{1}{4}\) h
Length \(=5\times\frac{1}{4}=1.25\) km \(=1250\) m