A girl walking at a speed of 9 km/h crosses a bridge in 45 minutes. Find the length of the bridge in metres.

Correct option is C

Given:
Speed of girl = 9km/hr
Time taken =45min
Formula Used:
Distance = Speed x Time
Solution:
​$$D = 9 \times \frac{ 45}{60}= \frac{27}{4 }km \times1000 = 6750 m ( 1km= 1000m)$$​​