General Aptitude › Time and Distance › Question #4695
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QA automobile travels 80 kilometres per hour for ten hours. How much faster must the automobile be driven if the same distance is to be completed in four hours?

ID: #4695 Time and Distance 144 views
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#4695Q ID
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Time and DistanceTopic
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  • A 40km/hr ✔ ✖
  • B 60km/hr ✔ ✖
  • C 90km/hr ✔ ✖
  • D 120km/hr ✔ ✖
Correct Answer

Explanation


Calculate the increase in speed of an object that traveled a distance of 800 kilometers in 4 hours, starting at an initial speed of 80 km/hr. Here is the correct calculation:

Initial speed = 80 km/hr
Total distance = 80 * 10 = 800 km
New speed = distance/time = 800 km / 4 hours = 200 km/hr
Increase in speed = new speed - initial speed = 200 km/hr - 80 km/hr = 120 km/hr.
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