Question

От деревни до города велосипедист ехал 4 ч со скоростью 12 км/ч. Сколько времени он потратит на обратный путь по той же дороге, если увеличит скорость на 4 км/ч? с краткой запесеь​

Answer 1

Ответ:

Дано:

t ¹— 4 часа

V¹ — 12 км/ч

V² — ?, на 4 >

———————

t² — ?

Решение:

1) V¹ + t¹= 12×4=48 км — S (расстояние)

2) 12+4=16 км/ч — V²

3) 48÷16=3 ч — t² (время)

Ответ: 3 часа.

Answer 2

Calculation of Time for the Return Trip

To calculate the time the cyclist will spend on the return trip, we need to consider the increased speed.

Given: - Distance from the village to the city: 12 km - Time taken for the forward trip: 4 hours - Speed during the forward trip: 12 km/h - Increased speed for the return trip: +4 km/h

To find the time for the return trip, we can use the formula:

Time = Distance / Speed

Let's calculate the time for the return trip:

1. Calculate the distance for the return trip, which is the same as the distance from the village to the city: 12 km. 2. Calculate the speed for the return trip by adding the increased speed to the speed during the forward trip: 12 km/h + 4 km/h = 16 km/h. 3. Use the formula to calculate the time for the return trip: Time = Distance / Speed. - Time = 12 km / 16 km/h = 0.75 hours.

Therefore, the cyclist will spend 0.75 hours (or 45 minutes) on the return trip.

Please note that the above calculation assumes a constant speed throughout the trip and does not account for factors such as breaks, fatigue, or changes in terrain.