Listen and read the text again. Tell the class three things you found interesting in the texts. -Imagine you experienced either of the two disasters. Describe your experience and feelings.

6/x  время в 1 день по озеру
20/(x+2)   время в 1 день по течению реки
15/х  время во 2 день по течению
6/x+20/(x+2)=15/x+1

26x+12=15x+30+2x+x^2
x^2-9x+18=0
x=6
x=3