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Time taken by A is 5/7 of B's time for t...

Time taken by A is 5/7 of B's time for the same length of race.The speed of A is 84 m/s and A betas B by 240 m.What is the length of the race course?

A

A) 840m

B

B) 800 m

C

C) 760m

D

D) 789m

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