Question

«Серёжа стал догонять Колю, когда тот находился от него на расстоянии 840 м, и догнал через 6 мин. Найти скорость коли, если его скорость в 2 раза меньше, чем у Серёжи.

Answer 1

(840:6):2=70(м в мин).

Жми хотябы спасибо чтоли.

Answer 2

(840:6):2=70(м/мин)

Ответ:V Коли 70м/мин.

Answer 3

Problem Analysis

We are given that Sergey is chasing Kolya, and when Kolya is 840 meters away from Sergey, Sergey catches up to him in 6 minutes. We need to find Kolya's speed given that his speed is half of Sergey's speed.

Solution

Let's assume Sergey's speed is S and Kolya's speed is K. We are given that Kolya's speed is half of Sergey's speed, so we can write the equation:

K = (1/2)S

We are also given that when Kolya is 840 meters away from Sergey, Sergey catches up to him in 6 minutes. We can use the formula distance = speed × time to write the equation:

840 = S × (6/60)

Simplifying the equation, we get:

840 = S/10

Solving this equation for S, we find:

S = 840 × 10 = 8400 meters per hour

Since Kolya's speed is half of Sergey's speed, we can substitute the value of S into the equation for K:

K = (1/2) × 8400 = 4200 meters per hour

Therefore, Kolya's speed is 4200 meters per hour.

Answer

Kolya's speed is 4200 meters per hour.