Question

Когда автомобилист находился в 2 км. от вокзала,до отправления поезда оставалось 2 минуты. Первую минуту автомобилист ехал со скоростью 30 км./час. С какой скоростью он должен ехать вторую минуту, чтобы успеть на поезд? помогите решить задачу но там есть ловушки

Answer 1

В часе 60 минут, 30÷60=0,5км/мин скорость автомобилиста в первую минуту.
2-0,5=1,5км нужно проехать за вторую минуту
1,5×60=90км/ч
Ответ: со скоростью 90км/ч должен ехать автомобилист вторую минуту

Answer 2

30км/ч=500м/мин , то есть за первую минуты автомобилист проехал 500м

500м=0,5км

2км-0,5км=1,5км осталось проехать за минуту

1,5км/мин=90км/ч он должен ехать вторую минуту

Answer 3

Problem Analysis

To solve this problem, we need to determine the speed at which the driver should travel during the second minute in order to catch the train. We are given that the driver is 2 km away from the station and has 2 minutes left until the train departs. During the first minute, the driver travels at a speed of 30 km/h. We need to find the speed for the second minute.

Solution

Let's break down the problem step by step:

1. Calculate the distance covered during the first minute: - Speed = 30 km/h - Time = 1 minute = 1/60 hours - Distance = Speed * Time = 30 * (1/60) = 0.5 km

2. Calculate the remaining distance to the station after the first minute: - Total distance = 2 km - Distance covered during the first minute = 0.5 km - Remaining distance = Total distance - Distance covered during the first minute = 2 - 0.5 = 1.5 km

3. Calculate the time remaining to catch the train after the first minute: - Total time = 2 minutes - Time spent during the first minute = 1 minute - Remaining time = Total time - Time spent during the first minute = 2 - 1 = 1 minute

4. Calculate the speed required to cover the remaining distance in the remaining time: - Speed = Distance / Time = 1.5 km / (1/60) hours = 90 km/h

Answer

To catch the train, the driver should travel at a speed of 90 km/h during the second minute.