Выберите правильный вариант ответа)

скорость сближения

40+70=110км/ч

660км/110=6 часов -они встретятся

40км/ч*6ч=240км от станции

70км/ч*6=420км от станции

 

 

 

 

 

 

 

 

40+70=110км/ч- скорость сближения660/110=6ч- через столько они встретятся40*6=240 км- проедит 1 поезд до встречи70*6=420 км- проедит до встречи второй поезд

1.Your parents’ parents are your grandmother and your grandfather. – Родители твоих родителей – это бабушка и дедушка.

2. Your father’s brother and sister are your uncle and your aunt. – Брат и сестра твоего отца – это дядя и тетя.

3. Your aunt’s and uncle’s children are your cousins. – Дети тети и дяди – это двоюродные братья и сестры.

4. Your brother’s son and daughter are your nephew and your niece. – Сын и дочь твоего брата – это племянник и племянница.

5. Your children’s children are your grandsons and your granddaughters. – Дети детей – это внуки и внучки.

Объяснение:

Ihad been doing my homework for two hours when my mother came. we had been driving a car for three hours before our car broke down. tom had been watching the film for 2 hours when the tv screen suddenly went blank. she  had not  been sleeping for a night before we returned.  why had you been waiting for us since 5 o'clock before we came? who had been discussing this problem for an hour when we came? he had been playing computer games for three hours when we came.what had they been doing for an hour before we came? the pupils had been writing a test for two hours before the bell rang.