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QIn 4 minutes, a runner crosses a 500-meter-long bridge. How fast is he running?

ID: #4699 Time and Distance 238 views
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#4699Q ID
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Time and DistanceTopic
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  • A 8.5 km/hr ✔ ✖
  • B 7.5 km/hr ✔ ✖
  • C 9.5 km/hr ✔ ✖
  • D 6.5 km/hr ✔ ✖
Correct Answer

Explanation


Distance = 500 meters
Time = 4 minutes = 4 * 60 seconds = 240 seconds
Speed = distance/time = 500 meters / 240 seconds = 25/12 m/s

To convert the speed from m/s to km/hr, we use the conversion factor: 1 m/s = 18/5 km/hr

Speed in km/hr = (25/12 m/s) * (18/5 km/hr/m/s) 

= (25/12) * (18/5) 

= (225/60) = (45/12) 

= (5/12) * 9 = (5/4) 

= 7.5 km/hr.
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