Charles is jogging while listening to his favorite album. He runs at 6 MPH when he's got music on and 4 MPH when he doesn't. His album is 40 minutes long. How many minutes will it take him to jog 6 miles?
Let's be accurate as possible. Think before you answer.
70
He runs at.

1 miles per minute because 6 / 60 =.

1.

While the album is playing he can run 4 miles because 40 x.

1 = 4.

He has to run 2 miles without the album because 6 - 4 = 2.

Without music he runs 1 / 15 miles per minute because 4 / 60 = 1 / 15.

He will run the remaining 2 miles in 30 minutes because 2 / (1 / 15) = 30.

It will take him 70 minutes in total because 40 + 30 = 70.

.

The final answer: 70