Question

Электричка за 4 часа проехала 360 км.На сколько км/ч нужно увеличить скорость электрички, чтобы она тоже расстояние проехала за 3 ч?

Answer 1

360:4=90км/ч первоначальная скорость
360:3=120км/ч увеличенная скорость
120-90=30км/ч на столько нужно увеличить скорость

Answer 2

Calculation of Increased Speed

To determine the increase in speed required for the train to cover the same distance in 3 hours instead of 4 hours, we can use the formula:

Speed = Distance / Time

Given that the train traveled 360 km in 4 hours, we can calculate its initial speed as:

Initial Speed = 360 km / 4 hours = 90 km/h.

To find the increased speed needed to cover the same distance in 3 hours, we can use the same formula:

Increased Speed = Distance / Time

Substituting the values, we get:

Increased Speed = 360 km / 3 hours = 120 km/h.

Therefore, the train needs to increase its speed by 30 km/h to cover the same distance in 3 hours instead of 4 hours.

Conclusion

To cover the distance of 360 km in 3 hours instead of 4 hours, the train needs to increase its speed by 30 km/h, resulting in a total speed of 120 km/h.