A barge model 1 m long is tested in a towing tank at a speed of 1

Question:

A barge model 1 m long is tested in a towing tank at a speed of 1 m/sec. Determine the prototype velocity if the prototype is 150 m in length. The model has a 2-cm draft and is 10 cm wide. The drag coefficient is CD = 0.25 for NR > 5 × 104, and the towing force required to tow the model is 0.3 N. What force is required to tow the barge in waterways?