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Over 1 km, A beats B by 100 m and C by 190 m. A's time is 162 s. By how many seconds does B beat C over 1 km?

Competition practiceRaces & Circular Tracks

A20 s
B18 s
C38 s
D15 s

Step-by-Step Solution

B's speed

= 0.9

of A's and C's

= 0.81

. Times: B

= \frac{162}{0.9} = 180

s, C

= \frac{162}{0.81} = 200

s. B beats C by 20 s.

Answer: A) 20 s

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