Asaad and Abrar competed in a 1 km race. Asaad completed the race in CC seconds and Abrar completed it in CCLXXXII seconds. By how many seconds (in Roman numerals) was Asaad ahead of Abrar?

A publisher published 8170 books in the year 1998, 5383 books in 1999, 6204 books in 2000 and 2131 books in 2001. How many books were published in total over these four years?

A publisher published 1099 books in the year 2003, 650 books in 2004, 7408 books in 2005 and 6565 books in 2006. How many books were published in total over these four years?

A tank of water contains 81 liters and 870 milliliters of water. There's a hole in the bottom of the tank through which 5 l 320 ml water leaks away every hour. How many liters of water are left in the tank after 3 hours?