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