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VTMO 2013 — Grade 7 — semifinal Question 10

VTMO · VTMO 2013 — Grade 7 — semifinal

Question 10

A boat takes four hours downstream $A$→$B$ and eight upstream. How long does a drifting raft take $A$→$B$?
  1. $8$
  2. $12$
  3. $4$
  4. $16$
  5. $32$