Sally travels by car from one city to another. She drives for 40.2 min at 80.0 km/h, 12.0 min at 105 km/h, and 45.0 min at 40.0 km/h. She spends 13.7 min eating lunch and buying gas.

(a) Determine the total distance traveled in km.
(b) Determine the average speed for the trip in km/h.

a)91.0 km

b)53.5 km/h

To determine the total distance traveled by Sally and the average speed for the trip, we need to calculate the distance covered during each leg of the journey.

First, let's calculate the distance covered during each leg of the journey:

1. In the first leg, Sally drives for 40.2 minutes at a speed of 80.0 km/h. To calculate the distance, we multiply the time (in hours) by the speed:
Distance1 = Time1 * Speed1 = (40.2 min / 60 min/h) * 80.0 km/h = 53.6 km

2. In the second leg, Sally drives for 12.0 minutes at a speed of 105 km/h:
Distance2 = Time2 * Speed2 = (12.0 min / 60 min/h) * 105 km/h = 21.0 km

3. In the third leg, Sally drives for 45.0 minutes at a speed of 40.0 km/h:
Distance3 = Time3 * Speed3 = (45.0 min / 60 min/h) * 40.0 km/h = 30.0 km

Now, let's calculate the total distance traveled:
Total distance = Distance1 + Distance2 + Distance3 = 53.6 km + 21.0 km + 30.0 km = 104.6 km

To determine the average speed for the trip, we need to calculate the total time spent driving (excluding the lunch and gas stop) and divide it by the total distance traveled.

Total time spent driving = Time1 + Time2 + Time3 = 40.2 min + 12.0 min + 45.0 min = 97.2 min

Total time spent driving (in hours) = 97.2 min / 60 min/h = 1.62 h

Average speed = Total distance / Total time spent driving = 104.6 km / 1.62 h = 64.57 km/h

So, the answers to the questions are:
(a) The total distance traveled is 104.6 km.
(b) The average speed for the trip is 64.57 km/h.

Sally travels by car from one city to another. She drives for 20.0 min at 64.0 km/h, 37.0 min at 43.0 km/h, and 18.0 min at 66.0 km/h, and she spends 10.0 min eating lunch and buying gas.

(a) Determine the average speed for the trip.
1 . km/h
(b) Determine the total distance traveled.
2 . km

use minutes/60 to get times in hours

.67 * 80 = 53.6
0.2 * 105 = 21
.75 * 40 = 30
.228 *0 = 0
--------------- add times and distances
1.85 hr 104.6 km
so
(a) 104.6 km
(b) = 104.6/1.85 = 56.5 km/hr