(2)3t+6(t-6.5)=33 Solution: t = 8,5. How to do the problem on page 75 18 in the first volume of seventh grade mathematics?

Tom ran with a puppy at a speed of 3 meters per second and found a bone 33 meters ahead. The puppy rushed forward at a speed of 6m/s, and Tom continued to move forward at the original speed. After the puppy arrived at the destination, it took 1 sec to catch the bone, then quickly turned around and returned to Tom at a speed of 6m/s ... (1) If it takes t seconds for the puppy to leave Tom and rejoin Tom, use an algebraic expression containing t to represent the distance the puppy has traveled during this time; (2) How long did the puppy leave Tom and return to Tom?