# Time varies inversely with speed if the distance is constant. A trip takes 4 hours at 80 km/h. How long does it take at 64 km/h?

##### 1 Answer

Aug 27, 2017

#### Explanation:

When two variables are inversely proportional, their product is equal to a constant.

In this case,

We are given the fact that the "trip takes

Let's substitute these values into the equation:

So the total distance of the trip is

Let's find out how long it takes to travel this distance at

Therefore, the trip takes