When Xiao Ying came home between 1 1 and 12 at noon, he saw that the hour hand and the minute hand of the wall clock were at right angles. Can you work out what time 1 1 is?

(180-30)/(6-0.5) =150/5.5 = 27 and 3/ 1 1.

Answer: The hour hand and the minute hand just form a right angle, which are 1 1: 27 and 3/ 1 1: 00 respectively.

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