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 Post subject: MathsPosted: Mon Sep 26, 2016 12:14 pm

Joined: Sat Sep 29, 2007 11:24 pm
Posts: 124
Can anyone help pls. I need a simplest way to work the question below in order to explain it to a 10 year old.

1: Ravi runs 10km at a speed of 8km per hour. How many minutes before Jessica does he complete the run? (Jess completes the run in 100 minutes)

The question is about speed, distance, time. Time=S/D
So do you divide 10 and 8 by 2 and get 4 over 5 or do you divide both numbers and get 1.25. So confusing:( finding it difficult to explain. TIA

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 12:17 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 13993
Rash wrote:
Can anyone help pls. I need a simplest way to work the question below in order to explain it to a 10 year old.

1: Ravi runs 10km at a speed of 8km per hour. How many minutes before Jessica does he complete the run? (Jess completes the run in 100 minutes)

The question is about speed, distance, time. Time=S/D
So do you divide 10 and 8 by 2 and get 4 over 5 or do you divide both numbers and get 1.25. So confusing:( finding it difficult to explain. TIA

Speed = distance/time so time = distance/speed

Does that help?

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 12:24 pm

Joined: Sat Sep 29, 2007 11:24 pm
Posts: 124
So do you divide 10 by8? Would this be a caculator or non calculator question? Ta

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 12:32 pm

Joined: Sun Jan 03, 2016 11:44 pm
Posts: 104
Hi Rash. I would have assumed that all Maths questions at 11plus would be non-calculator. Is your child able to divide into decimals?

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 12:35 pm

Joined: Sun Jan 03, 2016 11:44 pm
Posts: 104
He runs in 1.25 hours (75 minutes)

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 12:46 pm

Joined: Sat Sep 29, 2007 11:24 pm
Posts: 124
Yes, she does. Thank you.

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 Post subject: Re: MathsPosted: Mon Sep 26, 2016 10:47 pm

Joined: Wed Jan 29, 2014 9:42 pm
Posts: 57
Interesting. If I had to explain this to a 10 year old I'd put it like this:
The first 8km takes 1 hour. Then the remaining 2km takes 2/8 hr, i.e. 1/4 hr, namely 15 mins. Total 75 mins.
I wouldn't expect a 10 year old to know equations about speed and time!

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 Post subject: Re: MathsPosted: Tue Sep 27, 2016 7:45 am

Joined: Sat Sep 29, 2007 11:24 pm
Posts: 124
Thank you Albatross,

That's exactly what I was struggling with, whether to let her work it out her own way or to introduce the equation, which she may find hard to remember at this stage. However, I've come to the conclusion that if the answer is correct and it doesn't matter how they got to it then I would leave it for now.
Although, after dividing the two numbers she got 1.25 but I believe when under exam conditions a child can easily get confused with 1 hour 25 minutes. :0

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 Post subject: Re: MathsPosted: Thu Oct 06, 2016 10:46 am

Joined: Wed Jul 13, 2016 8:36 pm
Posts: 138
We calculate it as below
Time = Distance/speed
10 km / 8 = 5/4 hours

Which is 1 hour ¼ mins. (1/4 hour is 15 mins)

So it is 1 hour 15 mins which is equal to 75 mins

I think it helps to know the formula for Speed & time.

I like the simple way Albatross has explained.

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