Question

It took 48 minutes to drive downtown. An app estimated it would be less than that. If the error was 20%, what was the app’s estimate?

Answer 1

38.3

Explanation:

38.3

Answer 2

The estimated taken to drive downtown using App is 38.4 minutes

Explanation:

Given as :

The initial time taken to drive downtown = i = 48 minutes

The percentage error of time = r = 20%

Let The estimated time using app = t min

Let the time = 1 min

Now, according to question

The estimated time using app = The initial time taken to drive downtown ×
`(1-(\textrm rate)/(100))^(\textrm time)`

Or, t minutes = i minutes ×
`(1-(\textrm r)/(100))^(\textrm 1)`

Or, t = 48 minutes ×
`(1-(\textrm 20)/(100))^(\textrm 1)`

Or, t = 48 minutes ×
`(100-20)/(100)`

Or, t = 48 minutes ×
`(80)/(100)`

∴ t =
`(48* 80)/(100)` minutes

I.e t = 38.4 minutes

Or, The estimated time using app = t = 38.4 min

Hence, The estimated taken to drive downtown using App is 38.4 minutes Answer