If a book is pushed across the table with a force of 20 Ne and the friction that occurs pushes back in the opposite direction of 15 Newtons, what is the net force on the book?

wavelength divides in half and speed stays the same.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min