81. If A can run 1 km in 3 minutes and 10 seconds and B can cover the same distance in 3 minutes and 20 seconds, by what distance can A beat B?
- A. 50 meters
- B. None of these
- C. 40 meters
- D. 45 meters
Check answer and explanation
Answer: 50 meters
Explanation To find the distance by which A beats B, we need to calculate the distance covered by B in the extra 10 seconds taken by B. Since B covers 1 km in 3 minutes 20 seconds, B's speed is 1 km / 200 seconds. In 10 seconds, B covers 10/200 km = 50 meters. So, A beats B by 50 meters .