Ask
your own question, for FREE!

Mathematics
77 Online

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

somnium:
bro is it fair or not to say xxanteria is the original krushfunk artist? i have a

2 hours ago
2 Replies
1 Medal

Wolf95:
Would you rather be a famous singer or the next Einstein? Why?

5 hours ago
24 Replies
4 Medals

LilacZeus:
A jar of alphabet tiles contains 10 unique consonant tiles and 5 unique vowel tiles.

6 hours ago
3 Replies
0 Medals

toga:
who thinks that asking for money on this site should be against the rules

8 hours ago
4 Replies
2 Medals

jayfrmdAO:
maybe i should do a 20 maybe i should break that 20 do a ten maybe do a 5 if he g

9 hours ago
1 Reply
0 Medals

Thayes:
I think it's crazy I'm the one who they labelled as controversial And Cardi B is

9 hours ago
6 Replies
4 Medals