Average Speed between two cities

[Chiffy]

Pauline travels between two cities. First she drives for 31 minutes at an average speed of 82 km/hr then for 23 minutes at an average speed of 51 km/hr, then she spends 25 minutes eating lunch and buying gas, and then she drives for 15 minutes at an average speed of 44 km/hr.

Find Pauline’s average speed for this trip. Express it in kilometers and round your answer to the nearest kilometer

I know I have to use the average speed formula, which is total distance/time (94 minutes in this case). How do I get the time taken from 31 minutes at an average speed of 82km/hr, etc...?

 

[BvU]

Hello Chiffy, and welcome to PF. Posting a question means filling in the template.

Homework Statement

Pauline travels between two cities. First she drives for 31 minutes at an average speed of 82 km/hr then for 23 minutes at an average speed of 51 km/hr, then she spends 25 minutes eating lunch and buying gas, and then she drives for 15 minutes at an average speed of 44 km/hr.
Find Pauline’s average speed for this trip. Express it in kilometers and round your answer to the nearest kilometer

Expresssing a speed in kilometers is going to be very impossible. perhaps they want kilometers per hour ?​

Homework Equations

average speed formula, which is total distance/time

The Attempt at a Solution

oops. Something like: I have total time, now all I need is total distance. That is distance covered in first 31 min plus distance .. etc. Not so difficult, right ? Except for the last part, perhaps.

Your question:

How do I get the time taken from 31 minutes at an average speed of 82km/hr, etc...?

Is answered with: "31 minutes" etc.

Not what you hoped for, I suppose. Perhaps you want the distance ? 1 hour 82 km, 2 hours 2 * 82 km, 1/2 hour: 1/2 hour * 82 km/hour = 41 km. Recognize the pattern ?