एक घड़ी को 6 बजे 6 बार बजने में 10 सेकंड का समय लगता है। उसी घड़ी को 12 बजे 12 बार बजने में कितने सेकंड का समय लगेगा?

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?