(This number story is written by Dina, aged 10, The International School of Macao)
One day, two little polar bears were sitting on three pieces of ice. Four little seals were sleeping on five pieces of ice. Six little penguins were swimming in the ocean. Seven little fish were swimming in the ocean too. Eight birds were flying in the sky. Nine big whales were swimming in the ocean. They all played for ten minutes.
How long did the fish and the seals spend playing?