an iron ball of mass 5 kg at 100 degree temperature is dipped in water of mass 10 kg at 20 degree Celsius find final temperature if specific heat capacity of water is 4200J/kg degree Celsius and iron 470J/kg degree Celsius​

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?