Question

Мотоциклист проезжает путь между двумя городами за 5 ч. После 3 ч движения оно делает остановку на 48 мин. Чтобы прибыть вовремя, водителю надо увеличить скорость на 20 км/ч. Найти первоночальную скорость мотоциклиста

Answer 1

Y/x=5
y/(x+20)=4.2
y=5*x
5x/(x+20)=4.2
5x/(x+20)=21/5
5x*5=(x+20)*21
25x=21x+420
25x-21x=420
4x=420
x=420/4
x=105
Ответ: первоночальная скорость мотоциклиста 105 км в час

Answer 2

Calculation of Initial Speed of the Motorcyclist

To find the initial speed of the motorcyclist, we need to analyze the information provided.

According to the given information: - The motorcyclist completes the journey between two cities in 5 hours. - After 3 hours of travel, the motorcyclist makes a stop for 48 minutes. - To arrive on time, the driver needs to increase their speed by 20 km/h.

To calculate the initial speed, we can use the formula:

Distance = Speed × Time

Let's break down the information step by step:

1. The motorcyclist completes the journey in 5 hours. 2. After 3 hours of travel, the motorcyclist makes a stop for 48 minutes. This means that the motorcyclist has been traveling for 3 hours and 48 minutes (or 3.8 hours) before the stop. 3. After the stop, the motorcyclist needs to cover the remaining distance in the remaining time, which is 5 hours minus the time spent before the stop (3.8 hours). 4. The motorcyclist needs to increase their speed by 20 km/h to arrive on time.

Let's calculate the initial speed using the given information:

1. Calculate the time spent after the stop: - Time spent after the stop = Total travel time - Time spent before the stop - Time spent after the stop = 5 hours - 3.8 hours - Time spent after the stop = 1.2 hours

2. Calculate the distance covered after the stop: - Distance covered after the stop = Speed × Time spent after the stop

3. Calculate the remaining distance: - Remaining distance = Total distance - Distance covered after the stop

4. Calculate the initial speed: - Initial speed = Remaining distance ÷ Remaining time

Let's plug in the values and calculate the initial speed:

1. Calculate the time spent after the stop: - Time spent after the stop = 5 hours - 3.8 hours - Time spent after the stop = 1.2 hours

2. Calculate the distance covered after the stop: - Distance covered after the stop = Speed × Time spent after the stop

3. Calculate the remaining distance: - Remaining distance = Total distance - Distance covered after the stop

4. Calculate the initial speed: - Initial speed = Remaining distance ÷ Remaining time

Unfortunately, the exact values for the total distance and the remaining distance are not provided in the given information. Without these values, we cannot calculate the initial speed of the motorcyclist.

Please provide the total distance or any additional information to proceed with the calculation.