Pauline travels between two cities. first she drives for 40 minutes at an average speed of 88 km/hr then for 40 minutes at an average speed of 75 km/hr, then she spends 17 minutes eating lunch and buying gas, and then she drives for 23 minutes at an average speed of 49 km/hr. find pauline's average speed for this trip. express it in kilometers per hour and round your answer to the nearest km/hr.

Pauline's average speed for this trip is 64 km/hr.

Explanation

First we will convert each 'minutes' into 'hours' . So......

40 minutes = and 23 minutes =

Now,  

So, the distance traveled for first 40 minutes at 88 km/hr speed ,

the distance traveled for next 40 minutes at 75 km/hr speed and

the distance traveled last 23 minutes at 49 km/hr speed

So, the total distance traveled

She spends 17 minutes eating lunch and buying gas.

So, the total time taken for the trip

Thus, Pauline's average speed for this trip = (Total distance / Total time) (Rounded to the nearest km/hr)

90

step-by-step explanation:

you need to show the graph

step-by-step explanation: