Sign Up!
Login
Welcome to Test-paper.info
Sunday, December 17 2017 @ 04:04 AM CST
 Forum Index >  General Chat >  General Chat
 P6 Maths Nanhua 2012 SA1 Paper 1 Q29
   |  Printable Version
By: doreenJ (offline)  Thursday, May 16 2013 @ 06:31 AM CDT (Read 1444 times)  
doreenJ



Jim is preparing for his triathlon. Last Sunday, he cycled at a uniform speed 15 km/h to a park. He cycled at a uniform speed of 12 km/h for his return trip. What was his average speed for the whole trip? ( Give your answer in fraction.)


Please help!

Forum Newbie
Newbie


Registered: 11/08/11
Posts: 3

Profile Email    
   
By: echeewh (offline)  Thursday, May 16 2013 @ 08:44 AM CDT  
echeewh

Hi Doreen,

//
19May: Updated
My sincere apologies for overlooking that. Apparently the answerkey of 13 1/3 km/h is correct.

Many thanks to <aceacademy> and <jo sarah> for pointing that out. Pls refer to solution presented by <aceacademy>
//


I guess why you asked this is because the <answerkey> turns out to be 13 1/3 km/h. Am I correct?

If your answer is 13 1/2 km/h instead, then I think you should feel good about it .

Hope this helps.

Cheers,
Edward




Forum Active Member
Active Member

Registered: 04/21/11
Posts: 627

Profile Email    
   
By: doreenJ (offline)  Thursday, May 16 2013 @ 09:45 AM CDT  
doreenJ

Thanks Edward , I got the answer 13 1/2 km/h. Laughing Out Loud

Forum Newbie
Newbie

Registered: 11/08/11
Posts: 3

Profile Email    
   
By: aceacademy (offline)  Saturday, May 18 2013 @ 12:25 AM CDT  
aceacademy

Hi,

13 1/3 km/h is the correct answer.

Working:

Assuming the park is 15km away.

Trip to park took 1h.
Return trip took (15/12)h = 1.25h.

Total distance = 30km
Total time taken = 2.25h

Ave speed for whole trip = (30 / 2.25) km/h = 13 1/3 km/h.

Hope this helps.

Forum Regular Member
Regular Member

Registered: 03/26/13
Posts: 88

Profile Email    
   
By: jo sarah (offline)  Saturday, May 18 2013 @ 09:15 AM CDT  
jo sarah

the correct answer is 13 1/3, not 13 1/2.

Remember: average speed is Total distance divide by Total time.

Big Grin

Forum Regular Member
Regular Member

Registered: 03/20/12
Posts: 111

Profile Email    
   
By: echeewh (offline)  Saturday, May 18 2013 @ 01:37 PM CDT  
echeewh

Hey Doreen,
My sincere apologies for overlooking that. Apparently the answerkey of 13 1/3 km/h is correct.

Many thanks to <aceacademy> and <jo sarah>.

Best regards,
Edward

Forum Active Member
Active Member

Registered: 04/21/11
Posts: 627

Profile Email    
   


 All times are CST. The time is now 04:04 am.
Normal Topic Normal Topic
Locked Topic Locked Topic
Sticky Topic Sticky Topic
New Post New Post
Sticky Topic w/ New Post Sticky Topic w/ New Post
Locked Topic w/ New Post Locked Topic w/ New Post
View Anonymous Posts 
Able to Post 
HTML Allowed 
Censored Content