Dear Aunt Jane,
Thank you so much for the lovely birthday card, the present and the money.
The jumper is great. Don't worry - it isn't too small ! Did you make it?
It was very generous of you to send me £50. I'm planning to spend it on a new MP3 player because I lost my old one. I want to buy an iPod, which is much better than the one I had before.
I had a great birthday! Mum made the most fantastic cake, and some of my friends came round for a party.
Hope to see you soon.
Lots of love,
Mark
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Составим уравнение:
x - скорость на втором участке
х-2 скорость на первом участке
(x-2)3+2x=24
3x-6+2x=24
5x=30
x=6
6 км/ч - скорость по гору
4 км/ч - скорость в гору