We had a lot of emails about this problem. You had to think very carefully in order to work out the times on the clock faces. Well done to Ben from St Michael's School who who sent in a completely correct solution. He said:

Red clock: 10.45
Blue clock: 7.15
Yellow clock: 5.35
Green clock: 7.49

The last one was particularly difficult and Ben explained that he looked upsidedown to find the answer!