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анонимПредположим, что скорость трактора х км/ч.
Поскольку скорость грузовика в 4 раза больше, она составила: 4 * х.
Скорость их сближения равна: 4 * х + х = 5 * х.
Поскольку машины встретились через 4 часа, получаем уравнение:
500 / 4 = 5 * х.
125 = 5 * х.
х = 125 / 5 = 25 км/ч (скорость трактора).
Скорость грузовика составила:
4 * х = 4 * 25 = 100 км/ч.
Ответ:
Скорость трактора 25 км/ч.
Автор:
essencemz3eДобавить свой ответ
Tim Bolt didn’t really like sport at all until he discovered something both new and unusual. “I was listening to the radio one day when I heard something that I thought must have been a joke. The DJ was talking about underwater hockey! When I realized it actually was a sport, I decided to find out more about it. To my surprise, I found a local team and before I knew it, I was part of it!”
Unlike water polo, where the action takes place above the water, underwater hockey is played at the bottom of the pool. Players wear masks, flippers and snorkels during the game. “The rulers are simple, you just have to slide the puck into the opposing team’s goal,” says Tim.
Underwater hockey was invented by a British diving club in 1954. Tim told us, “Unfortunately it’s not much of a spectator sport, as all people watching from outside the pool can see are lots of splashing and flippers!”
True or False?
1. According to Tim the rulers are not difficult……
2. Tim Bolt played ice hokey before………..
3. Underwater hockey is like water polo………..
4. You need some equipment such as masks, flippers and snorkels…….
5.Underwater hockey was invented in Canada……
Choose the right variant.
6. I am very good ……English.
a. at b. for c. about
7. John works Monday to Friday, 9 to 5. It’s a ……..job.
a. salary b. overtime c. full-time
8. Dave is …….He must go on a diet.
a. fit b. overweight c. responsible
9. ……..is a shaking of the ground
a. earthquake b. tornado c. hurricane
10. The …………..team scored three goals in 30 minutes and won the match.
a. physical b. opposing c. strapped
11. Big factories are responsible for water ……….
a. collection b. pollution c. Avalanche.
12. Computers had a huge .........on the 20th century.
a. impact b. download c. connect
13. Tony’s …… He doesn’t feel comfortable with people.
a. easy-going b. sociable c. shy
14. A more awful. ….... happened in China in 1998. It was caused by heavy rainfall.
a. flood b. blood c. cyclone
15. If I were you, I ………my favourite team play all over the world.
a. had watched b. had been watched c. watched
16. If I had time, I …………a game of football.
a. play b. would play c. Played
17. If you train hard, you …….on the team.
a. would get b. get c. gets
18. You should play……..than yesterday.
a. the most carefully b. more carefully c. carefullier
19. He swims ……..than the Canadian sportsman.
a. faster b. the fastest c. fast
20. “………we dance, Mr Clark?” asked Polina.
a. Shall b. Must c. Need
21.You …. do all your home work today, you can finish it tomorrow.
a. couldn’t b. mustn’t c. needn’t
22. ….. Volga is the longest river in Europe
a.- b. The c. A
23. …..Canada is in ……..North America
a. The/the b. The/- c. -/the
24.“I’ll go to Italy next year,” said Jane.
a. Jane said that she would go to Italy next year.
b. Jane said that she would go to Italy the year after.
c. Jane said that Jane would go to Italy the year after.
25.“I’m looking for a new house,” said Tim.
a. Tim said that he was looking for a new house.
b. Tim said that he is looking for a new house.
c. Tim said that he looking for a new house.
Form the from the words in bold.
26. Heavy traffic is one of the biggest ……..of living in a city. ADVANTAGE
27. ……… people live in the streets. HOME
28. He has a …………………….diet. HEALTH
29. The weather is ………Let’s stay home. RAIN
30. She is the most …………….. musician I know. SUCCESS
Complete the sentences using Past Simple or Past Continuous, Present Perfect , Present Simple
31. I…….the dog for a walk every day after school. (take)
32. He …….just ……home. ( come)
33. Nick ……football yesterday. (play)
34. ……you ever ……to New York? (be)
35.I …….at nine o'clock yesterday. (not sleep)
Write another sentence with the same meaning using the Passive Voice.
36. They will clean the office tomorrow.
37. Аnn cooks a special dinner on the 21st of May.
38. They arranged a nice picnic last month.
.1 Soldiers … obey their commander’s orders.
a) Must
b) Can
c) May
d) Will
2. I’ll come at 7 tomorrow. – No, you … come that early, we start much later.
a) Mustn’t
b) Don’t have to
c) Needn't
d) Can’t
3. How … be so rude with your teacher?
a) You could
b) You might
c) Might you
d) Could you
4. … I ask you how old you are?
a) May
d) Must
b) Could
c) Might
5. You … smoke on the plane – it’s against the rules.
a) Shouldn’t
b) Can’t
c) May not
d) Mustn’t
6. I can do it myself. You … bother.
a) Mustn’t
b) Shouldn’t
c) Needn’t
d) Wouldn’t
7. You … be so friendly to every person you meet.
Needn’t
b) Shouldn’t
c) Mustn’t
d) Can’t
8. Someone’s at the door. It … be Sharon, she promised to come.
a) Can
d) Must
b) Would
c) Might
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