Ask
your own question, for FREE!

Mathematics

OpenStudy (anonymous):

You drive 200 miles to city at an average speed 10 miles per hour faster than your usual average speed. If you completed the trip in 1 hour less than usual. What is your usual driving speed, in miles per hour?

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (anonymous):

d=(r)(t)

OpenStudy (anonymous):

please help!!!

OpenStudy (anonymous):

d=rt 200=(s+10)(t-1)

OpenStudy (anonymous):

d=rt 200=rt

OpenStudy (anonymous):

200= rt-r+10t-10 200=200-r+10t-10 200=190-r+10t

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (anonymous):

200-190=-r+10t 10=-r+10t

OpenStudy (anonymous):

r=10t-10

OpenStudy (anonymous):

200= (r+10)(t-1) 200=(10t-10+10)(t-1) we have substituted r

OpenStudy (anonymous):

200=(10t)(t-1) 200=10t^2-10t 0=10t^2-10t-200 which we can factorise

OpenStudy (anonymous):

0=10(t^2-t-20) 0=t^2-t-20 0=(t-5)(t+4) t=5 t=-4

Still Need Help?

Join the QuestionCove community and study together with friends!

OpenStudy (anonymous):

since time cannot be negative we take 5hrs

OpenStudy (anonymous):

now we find the speed =distance/time =200/5= 40mil/hr

Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!

Join our real-time social learning platform and learn together with your friends!

Latest Questions

Hdjricks:
At what point does a corporation make money from stocks?

33 minutes ago
2 Replies
2 Medals

Oliv:
A car picking up speed at a uniform rate from rest passes three VECO posts in succession.

15 seconds ago
4 Replies
0 Medals

Oliv:
A car picking up speed at a uniform rate from rest passes three VECO posts in succession.

7 minutes ago
1 Reply
0 Medals

Astro:
How to write an argumentative essay- A tutorial- Astro No comments please and tha

3 hours ago
2 Replies
6 Medals

stromj3688:
A battery contains two metals that have different tendencies to attract electrons.

5 hours ago
0 Replies
0 Medals

kittybasil:
QUERY: word problem? Not sure if this means the entire window or just the labeled

4 hours ago
34 Replies
8 Medals

yacine:
can anyone here explain to me how to calculate total resistance in a parallels/triangle circuit? everything on google makes no sense.

4 hours ago
32 Replies
2 Medals