physics

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A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 40.0 min at 85.0 km/h, 12.0 min at 95 km/h, and 35.0 min at 30.0 km/h, and spends 35.0 min eating lunch and buying gas. Determine the average speed for the trip?

• physics -

Use the same method as this question's answer. The numbers are different.
http://www.jiskha.com/display.cgi?id=1254706350

Add the non-driving time to the driving time and convert to hours. Then divide the total distance by that total time in hours.

• physics -

time
34.9+12.8+50.4+18.8=116.9/60=19.483hrs
distance
76.5+96.7+37.7=210.9
210.9km/1.1083hrs=190.2914km/h ??????
done it so many times am so confuse!!!

• physics -

Why are you using 1.1083 hr for total time? You already computed 19.483 hr, which should have been 1.9483 hr.

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