Вопрос школьника по предмету Математика
От двух городов расстояние между которыми 750 км, выехали 2 поезда. U1= ___ км в час, U2=__кмв час. через сколько часов они встретятся?Через 4 или через 5 ??( U1 b U2= 150 км в час
Ответ учителя по предмету Математика
b+150 (км/ч) — скорость сближения
750:(b+150)=750/b+750/150=750/b+5=750+5b
Они встретятся через 5 часов.
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