A can run a 400m race in 40 seconds, while B takes 50 seconds to complete it. If B starts 100 m ahead in the race, by how many seconds will he win the race?
Correct Answer: Description for Correct answer:
B takes 50 seconds to complete a 400m race. Therefore, his speed is \( \Large \frac{400}{50} \) m/sec.
If B starts 100 m ahead in the race, then B has to run only 300 m while A has to run 400 m.
So, B will take \( \Large \frac{300}{8} \) = 37.5 seconds to complete 300 m.
A will take 40 seconds to complete his 400 m.
Therefore, B will win the race by 2.5 seconds.
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