Велосипедист за первый час прошел 2 км,
затем за каждый последующий час он проходил
на 1 км больше, чем за предыдущий час. За какое
время велосипедист пройдет 20 км? Сделать при помощи прогресии​

I'm having a great time in Barcelona! I think it's the ______ (1) amazing city I've ever _____ (2) to! I've ______ (3) done lots of things. Yesterday we had a lovely walk around the "Barri Gottic", the ______ (4) and most beautiful part of the city. It was amazing! It has narrow, cobbled streets and really old buildings. We've also visited the Picasso Museum and _______ (5) a fantastic bus tour of the city. I haven't been ______ (6) that amazing cathedral, the "Sagrada Familia" yet, but I think I'm going tomorrow. I can't wait to show _____ (7) my photos when I get back. ______ (8) you soon

Well, here I am in Egypt! I'm having ______ (1) wonderful time! Cairo is a huge city - the ______ (2) city in Africa, I think. It's certainly much more noisy and even ______ (3) crowded than Boston! I've only been here for 3 days but we've _____ (4) done lots of amazing things. On the first day we _____ (5) to the Egyptian Museum and then we shopped for souvenirs in an amazing open-air bazaar. I haven't ______ (6) to the Pyramids yet, but we're going tomorrow hopefully. I can't believe they're _____ (7) 5000 years old! See _____ (8) when I get back!