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In a 800 m race around a stadium having the circumference of 200 m, the top runner meets the last runner on the 5th minute of the race. If the top runner runs at twice the speed of the last runner, what is the time taken by the top runner to finish the race ?

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20 min

15 min

10 min

5 min

answer is C.

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Detailed Solution

After 5 minutes (before meeting), the top runner covers 2 rounds i.e., 400 m and the last runner covers I round i.e., 200m.

$∴$ Top runner covers 800 m race in 10 minutes.

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