A race course is 400 m long. AA and BB run a race and AA wins by 5m. BB and CC run over the same course and BB win by 4m. CC and DD run over it and DD wins by 16m. If AA and DD run over it, then who would win and by how much? Answers.
A) 7.1 m  B) 7.2 m  C) 8 m  D) 9 m  E) 11 m
If AA covers 400m, 7.2 m7.2 m covers 395 m   If 7.2 m7.2 m covers 400m, CC covers 396 m   If DD covers 400m, CC covers 384 m   Now if 7.2 m7.2 m covers 395 m, then CC will cover 396400×395=391.05396400×395=391.05m   If CC covers 391.05 m, then DD will cover 400384×391.05=407.24400384×391.05=407.24   If AA and DD run over 400 m, then DD win by 7.2 m   Option 7.2 m
<result>B</result>
A race course is 400 m long. AA and BB run a race and AA wins by 5m. BB and CC run over the same course and BB win by 4m. CC and DD run over it and DD wins by 16m. If AA and DD run over it, then who would win and by how much?