The train at a speed of 85 km / h traveled between the two cities in 6 hours.

The train at a speed of 85 km / h traveled between the two cities in 6 hours. How many hours would he have covered this path at a speed of 100 km / h?

The problem can be solved in one action or using proportions, but we will analyze the solution of the problem step by step.
The train traveled for six hours at a speed of 85 km / h.
In order to find which path the train traveled, it is necessary to multiply the values of speed and travel time:
S = V * t;
S = 85 * 6;
S = 510 kilometers. The distance is 510 kilometers.
Let us express the value of time from the formula:
t = S / V;
We found the distance, the speed changed and is equal to 100 km / h. find the time:
t = 510/100 = 5.1 km / h.
Answer: 5.1 km / h.