Question

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

Answer 1

S=Vt
12 км/ч*4 ч=48 км (от деревни до города или обратно)
12 км/ч+4 км/ч=16 км/ч (новая скорость)
t=S:V
48 км:16 км/ч=3 ч
Ответ: с увеличенной скоростью велосипедист на обратный путь потратит 3 часа

Answer 2

Problem Analysis

A cyclist traveled from a village to a city for 4 hours at a speed of 12 km/h. The question is how much time the cyclist will spend on the return journey if they increase their speed by 4 km/h.

Solution

To find the time spent on the return journey, we need to calculate the distance traveled on the initial journey and then divide it by the increased speed.

Let's calculate the distance traveled on the initial journey:

Distance = Speed × Time

Distance = 12 km/h × 4 hours

Distance = 48 km

Now, let's calculate the time spent on the return journey:

Time = Distance / Speed

Time = 48 km / (12 km/h + 4 km/h)

Time = 48 km / 16 km/h

Time = 3 hours

The cyclist will spend 3 hours on the return journey if they increase their speed by 4 km/h.

Conclusion

The cyclist will spend 3 hours on the return journey if they increase their speed by 4 km/h.