Question

Поезд шел 10ч со скоростью 81 км/ч. С какой скоростью должен идти поезд, чтобы пройти то же расстояние за 9ч?

Answer 1

10*81=810(км)

810:9=90(км/ч)

Answer 2

81*10=810км

810/9=90км/ч

 

Answer 3

Calculation of the Required Speed

To determine the speed at which the train should travel to cover the same distance in 9 hours, we can use the formula:

Speed = Distance / Time

Given that the train traveled for 10 hours at a speed of 81 km/h, we can calculate the distance covered:

Distance = Speed × Time

Distance = 81 km/h × 10 h = 810 km

Now, we can calculate the required speed to cover the same distance in 9 hours:

Speed = Distance / Time

Speed = 810 km / 9 h = 90 km/h

Therefore, the train should travel at a speed of 90 km/h to cover the same distance in 9 hours.

Please note that the calculations above are based on the information provided and assume a constant speed throughout the journey.