Катер расстояние между двумя пристанями по течению реки за 3 ч, а против течения за 4 ч. Каково расстояние между этими пристанями, если скорость течения реки 2 км/ч?

 I am very glad to have got your letter.  I would like you to see.  How are you? How are your parents? I am missing you. Do you have any news? I haven't seen you for a long time. It's so good that we are still teenagers. To be a teenager it cool! Teenagers have a lot of free time, they have nothing to care about. But they have many problems. Any teenager has a lot of friends. Without them life would be boring. I've got acquainted with the beautiful girl. She looks like you. I want to marry her. Our parents say that's too early and we have to wait a little. Do you have a boyfriend? I would like you to meet my bride. Let me know what you think about this. It would be great to see you again, so that I could show you all the beautiful things in my city.