In 1 km race, A beats B by 18 m or 9 s. Find the A' s time over the co

1.	In 1 km race, A beats B by 18 m or 9 s. Find the A' s time over the course.
A.	391 s
B.	591 s
C.	491 s
D.	500 s
Answer» D. 500 s

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In 1 km race, A beats B by 18 m or 9 s. Find the A' s time over the course.

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