First they had to make a syrup by heating lemon juice and water.
Next they chopped up strawberries and blitzed them in the blender before adding them to the syrup.
Finally they poured the liquid into ice block containers and put them in the freezer overnight.
The recipe said to leave them for 6 hours. The girls checked after 4 and a half hours but they weren't quite ready. Can you use your maths knowledge to work out how much longer they needed to have in the freezer?
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