Một con thuyền với vận tốc 50km/h vượt qua một khúc sông nước chảy mạnh mất 5 phút. Biết rằng đường đi của con thuyền tạo với bờ một góc 50°. Tính chiều rộng của khúc sông. Giups mik với ạ

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Many years ago when the summers seemed longer and life was (1).................... complicated. We had rented a cottage by a river in the beach of the country where were going to (2)....................... three weeks’ holiday . There were four of us : me (age 9 ) mum and dad and mum’s (3).................... , auntie June, oh, I mustn’t forget to (4) ................ Spot, our little dog . I was allowed to go off by (5)........... all day , (6).................. that I promised to be careful and took spot with me for (7) ............................... One day I was out fishing with spot when we heard a lot of shouting in the (8)......followed by a scream and a splash , I was a bit (9).....so I called spot and we both hide (10)...a bush where we could see but not be (11) ....After a few moments a straw hat came floating down the river , followed by a oar , a picnic basket and (12).... oar . Then came the rowing boat itself , but it was floating (13) ....down ! A few second later my dad and Auntie June came running (14).... the river bank , both wet (15) ...Spot started (16).... so I came out of hiding and said hello . My dad got really angry with me for not (17) .....to catch the boat as it went past . Luckily , however , the boat and both the oars had been caught by an overhanging tree a little further downstream , but the hat or the picnic basket . So I had to let them (18)...... my sandwiches . Dad and auntie both made me (19).... not to tell mum what had happened in (20)....she was worried .