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 By: doreenJ (offline)  Thursday, May 16 2013 @ 06:31 AM CDT (Read 1473 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.)

Newbie

Registered: 11/08/11
Posts: 3

 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?

Hope this helps.

Cheers,
Edward

Active Member

Registered: 04/21/11
Posts: 627

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

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

Newbie

Registered: 11/08/11
Posts: 3

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

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.

Regular Member

Registered: 03/26/13
Posts: 88

 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.

Regular Member

Registered: 03/20/12
Posts: 111

 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

Active Member

Registered: 04/21/11
Posts: 627

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