Question

Во время парада колонна военных машин проехала по мосту длина которого 700 м за 4 минуты, а мимо отдыхающего на лавочке ветерана за 3 минуты. Какова длина колоны?

Answer 1

Х длина колоны
(х+700)/4 скорость колонны м/мин
х/3 скорость колонны
(х+700)/4=х/3
3х+2100=4х
х=2100м=2км 100м

Answer 2

Calculation of the Length of the Column

To calculate the length of the column of military vehicles, we can use the information provided about the time it took for the column to pass by the resting veteran on the bench and the length of the bridge.

According to the information given, the column of military vehicles took 4 minutes to pass over a bridge that is 700 meters long. Additionally, the column passed by the veteran on the bench in 3 minutes.

To find the length of the column, we can set up a proportion using the time it took for the column to pass over the bridge and the time it took to pass by the veteran:

Length of the bridge / Time to pass over the bridge = Length of the column / Time to pass by the veteran

Let's substitute the given values into the proportion:

700 meters / 4 minutes = Length of the column / 3 minutes

To find the length of the column, we can cross-multiply and solve for the unknown:

700 meters * 3 minutes = Length of the column * 4 minutes

Length of the column = (700 meters * 3 minutes) / 4 minutes

Now, let's calculate the length of the column:

Length of the column = (700 * 3) / 4 = 525 meters

Therefore, the length of the column of military vehicles is 525 meters.

Please note that the calculation assumes a constant speed of the column throughout its passage over the bridge and past the veteran.