Предмет: Математика, автор: Аноним

от двух вокзалов расстояние между которыми 720 км вышли одновременно навстречу один другому два поезда. скорость одного поезда 50 км в час а другого 40 км в час. через сколько часов они встретятся?

Ответы

Автор ответа: polinaxt1

1) находим общую скорость
50+40=90
2)720/90=8(часов)
Ответ:8 часов

Автор ответа: Аноним

спасибо

Автор ответа: polinaxt1

помогла? или лучше объяснить?

Автор ответа: Аноним

я понял

Автор ответа: polinaxt1

ок

Автор ответа: pollilis

S=V•t
t=V:S
Vобщ=50+40=90(км/ч)
t=720:90=8(ч)
Ответ: через 8 часов встретятся поезда

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