दोपहर 1:00 बजे से रात 9:00 बजे तक चलने के दौरान एक घड़ी की घंटे की सुई और मिनट की सुई कितनी बार समकोण (90°) पर होंगी?

What is the angle between the hour hand and the minute hand of a clock at 12:55?

There are two clocks, both set to show 10 p.m. on 21st January, 2010. One clock gains 2 minutes in an hour and the other clock loses 5 minutes in an hour. By how many minutes do the two clocks differ at 4 p.m. on 22nd January, 2010?