Question

U1=70км/ч. t =? ч U2=90км /ч

Answer 1

Ответ:

Средняя скорость U = (U1+U2)/2 = (70+90)/2 = 80

Время t=S/U = 320/80 = 4

Ответ: 4ч

Пошаговое объяснение:

Answer 2

It seems like you are trying to calculate the time (t) it takes for an object to travel at speeds U1 and U2. To calculate the time (t), you need to know the distance (d) the object travels. The formula to calculate time (t) is:

t = d / U

Where: t = time (in hours) d = distance (in kilometers) U = speed (in kilometers per hour)

Since you haven't provided the distance, I cannot calculate the exact time. If you provide the distance (d), I'd be happy to help you calculate the time it takes for the object to travel at speeds U1 and U2.