1. The problem statement, all variables and given/known data A boat travels from A to B in the current's direction with constant speed in 140 minutes. In this situation the boat has F pushing force. If the boat travels with 9F, it arrives B in 60 minutes. In every circumstance the water resistance is directly proportional with the boat's sum velocity's square. What would be the ratio between the time taken when travelled from B to A towards the current with 9F and the time taken when travelled from B to A towards the current with F? Choices A) 3 B) 10 C) 8 D) 5 E) 2 Note: Sorry if the question isn't clear enough, I had to translate. Please ask if you didn't understand.