A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in meters) is

The speed of the person is $5$km/h

The time taken to cross the bridge is $15 \min \mathit{=}\frac{\mathit{15}}{\mathit{60}}\mathit{=}\mathit{0}\mathit{.}\mathit{25}\mathit{ }\mathrm{hours}$

The length of the bridge is 

$\begin{array}{rcl}dis\tan ce& =& speed\times time\\ & =& 5\times 0.25\\ & =& 1.25 \mathrm{km}\\ & =& 1250 \mathrm{meters}\end{array}$