The 580-ton tug is towing the 1200-ton coal barge at a steady speed of 6 knots. For a sh...

The 580-ton tug is towing the 1200-ton coal barge at a steady speed of 6 knots. For a short period of time, the stern winch takes in the towing cable at the rate of 2 ft/sec. Calculate the reduced speed v of the tug during this interval. Assume the tow cable to be horizontal. (Recall 1 knot = 1.688 ft/sec)