Two rockets are each 2000 m long in their rest frame. Rocket Orion, traveling at 0.80c relative to the earth, is overtaking rocket Sirius, which is poking along at a mere 0.60c. According to the crew on Sirius, how long does Orion take to completely pass? That is, how long is it from the instant the rose of Orion is at the tail of Sirius until the tail of Orion is at the nose of Siriu?