Question

The first minute is x and it costs y every extra minute. How long was the call? Help please. x and y actually have numbers.

Paul calls long distance to his friend Mike in Germany. The first minute of the call costs 3.75 $, and each additional minute costs 5 cents. The total cost of the call is 11.45 $. For how many minutes did the phone call between Paul and Mike last ?

Answer 1

Call was for `155` minutes.

Explanation:

Let the call be for `m` minutes

As first minute is `$3.75` and reaining `m-1` minutes are `5` cents or `$0.05` for each minute

total cost is `3.75+0.05(m-1)`

= `3.75+0.05m-0.05`

= `3.7+0.05m`

As total cost of call was `$11.45`

`3.7+0.05m=11.45`

or `0.05m=11.45-3.7=7.75`

or `5m=775`

or `m=775/5=155`

Hence call was for `155` minutes.