What are the correct answers? I keep getting it wrong and want to ask before I submit again

Through how many radians will the hour hand on a clock rotate in (a) 21 hr? In (b) 6 hr? (a) In 21 hr, the hour hand on the clock will rotate I radians (Type an exact answer in terms of x Type an integer or a simplified fraction.) (b) In 6 hr, the hour hand on the clock will rotate 3x radians (Type an exact answer in terms of x. Type an integer or a simplified fraction.)