A Difficult Question

four girls went to school every day by taxi .
one day one of the girls said,"there's a test this morning . let's get to school late
then we won't have to take the test ."
"what can we tell the teacher?" one of the girls said.he'll be angry . we'll need a good excuse moments ."
the girls though for several moments ,than one of them said ,"let's tell him that our taxi had a flat fire ."
"that's a good idea ,"the other girls said."we'll tell him that." they arrived at school an hour late . the test was finished .
"why are you late?"the teacher asked ."you missed the test."
"our taxi had a flat fire,"one of the girls said .
the teacher thought for a moment ,then he said ,"sit down ,one of you in each corner of the room ."
the four girls did this
than the teacher said ,"write on a piece of paper the answer to this question :which tire was flat?"

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