NASA's Cassini mission to Saturn released a probe on December 25, 2004, that landed on the Saturnian moon Titan on January 14, 2005. The probe, which was named Huygens, was released with a gentle relative speed of 31 cm/s. As Huygens moved away from the main spacecraft, it rotated at a rate of seven revolutions per minute. How many revolutions had Huygens completed when it was 160 yards from the mother ship? I know the answer is 55 rev; however, I got a completely different answer. I solved for the answer this way: 160yd*(3ft/yd)*(12in/ft)*(2.54cm/in) = x I then divided x by 31 cm/s, and multiplied it by 420 rev/s. Any help or advice would be much appreciated.