Rhonda can paint a room in 4 hours. sam can paint the same room in 5 hours. rhonda and sam worked together for one hour then sam finished the remaining part of the work alone. how long did it take sam to finish the remaining part?

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.