Molly made a trip to the recycling plant and back. The trip there took four hours and the trip back took six hours. She averaged 10 km/h faster on the trip there than on the return trip. What was Molly’s average speed on the outbound trip?

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.