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 By: shirley wee (offline)  Friday, June 29 2012 @ 06:48 AM CDT (Read 972 times)
shirley wee

Hi everyone! I am stuck with this Maths Question. I would like your help to solve it and please show your workings clearly

Ali took 50 seconds to type 15 words. How long will he take tp type 900 words? Express your answer as a fraction of 1 hour.

Chatty

Registered: 02/28/12
Posts: 68

 By: GIM (offline)  Friday, June 29 2012 @ 07:19 AM CDT
GIM

Solution:
15 words ------> 50seconds
900 words ----> 900/15 x 50 =3000seconds = 3000/(60 x 60) = 5/6 hour

Note : 1 hr = 60x60 =3600s

Regular Member

Registered: 11/07/10
Posts: 70

 By: shirley wee (offline)  Friday, June 29 2012 @ 07:40 AM CDT
shirley wee

I also have the same answer as you too... But the answer sheet that my teacher gave me wrote '1/12' I am really confused until I have a headache. Can you qualify again whether the answer has any mistakes, please? Thank you very much

Chatty

Registered: 02/28/12
Posts: 68

 By: GIM (offline)  Friday, June 29 2012 @ 08:00 AM CDT
GIM

Unless there is an error in the question where it should be 90 words and not 900 words, then the answer will be 1/12.
90/15 x50 = 300s/3600 = 1/12hr

I can't see anything wrong with the solution of 5/6 hr. Check with your teacher tomorrow.

Regular Member

Registered: 11/07/10
Posts: 70

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