Пошаговое объяснение:
There is bath in the bathroom
There is mirror in the bathroom
There is armchair in the hall
There is carpet in the hall
There is sofa in the hall
There are curtains in the hall
There are cushions in the hall
There is painting in the hall
There is cooker in the kitchen
There is chair in the kitchen
There is table in the kitchen
There is sink in the kitchen
There is fridge in the kitchen
There are pillows in the bedroom
There is desk in the bedroom
There is poster in the bedroom
There is wardrobe in the bedroom
There is bookcase in the bedroom
There are stairs leading from the first to the second floor
при скорости 100 м/мин за 20 мин они
100*20=2000 метров
100-30=70 м/мин
при скорости 70 м/мин за 20 мин они
70*20=1400 метров
всего они
2000+1400=3400 м=3км 400 м