Question

A driver leaves at 8:00am and drives 120km by 9:30am. from then until 10:30am, she travels another 50 km. she drives and additional 200km by 12:30pm. she travels at a constant speed during each period of time. what is the average speed for the entire trip? Please explain. Thanks

Answer 1

distance equals rate times time or : d=rt (rate being equivalent to speed)
We are asked for average speed for the complete trip. Compute distance:120km+50km+200km=370km for total trip. Next compute total time: 8:00AM to 12:30PM is 4.5 hours total time.
plug this in the equation d=rt
370=r *4.5
r=370km/4.5Hr=82.2222222 km/Hr average speed for entire trip. It should be noted that at different parts of the trips her speed varied, but considering only the entire trip 82.22Km/Hr should be good.

Answer 2

Thanks for your help!

Answer 3

you're welcome.