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'Clock Hands' printed from http://nrich.maths.org/
Why do this problem?
is one that explores spatial awareness more than exploring the pupils' ability to read clock faces.
It would probably be good to have something visual to help children to enter more confidently into this problem. Some cardboard cut-outs that enable the rotation would help.
How are you working out where the shapes should go?
Tell me about the overlap you've got here?
As suggested in the problem, exploring different shapes and looking at angles when both hands have moved might be a good next step.
Some pupils who find it hard to get into this problem might benefit from observing a more usual clock face with geared hands.