Water proof caulk. West Marine sells a really good one called White Life Seal that sets up in about 24 hrs. If the holes are bigger, you'll need a thicker epoxy, but they'll be able to recommend something at West Marine. Won't last forever, but should get you thru a 5 hr tow. Would also be sure I had some inflatables to go under it if the worst happens and the pumps can't keep up.
Get plastic sheet to go under the boat. Now sling the boat into the plastic. Once you have it in place pump out the water. Tape the plastic to the boat to keep water out. It will seal the leaks and protect the boat in travel. Make sure to remove the plastic, as the boat will dry up in a few days.