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VTMO 2014 — Grade 6 — semifinal Question 13

VTMO · VTMO 2014 — Grade 6 — semifinal

Question 13

Tap A fills a tank in $15$ minutes, $B$ in $10$. How long if both are opened?
  1. $6$
  2. $7.5$
  3. $8$
  4. $8.5$
  5. $9$