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

One clock show 10 pm. On 21st January 2010 one clock gains = 2 minutes Other clock loses = 5 minutes Time period between 10 pm and 4 pm = 18 hours Therefore, Required difference = (2 × 18 + 5 × 18) minutes = 126 minutes