1. A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in metres) is ?600 750 1000 1250
Question
- A man walking at the rate of 5 km/hr. crosses a bridge in 15 minutes. The length of the bridge (in metres) is ?600 750 1000 1250
Solution
The man walks at a speed of 5 km/hr. To convert this speed into meters per minute, we use the conversion factors 1000 meters = 1 km and 60 minutes = 1 hour.
So, 5 km/hr = 5 * 1000 meters/60 minutes = 5000/60 = 83.33 meters/minute.
The man crosses the bridge in 15 minutes. Therefore, the length of the bridge is his speed times the time it takes to cross.
So, the length of the bridge = 83.33 meters/minute * 15 minutes = 1250 meters.
Therefore, the length of the bridge is 1250 meters.
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