[Eloisea1]

Ali walked 1km in 12 minuets. He stopped for 10 minuets and then walked a further 3km in 38 minuets. Calculate his average speed in km/h. I understand that average speed = total distance dive total time , so should I add the time ali stopped as well? Can anyone help please? Thanks.

[Unknown008]

Yes, you would add the time he stopped too. What counts, is the time he departed and the time he arrived.

Can you give what you get? :)

[Eloisea1]

So he walked 4km in 60mins so it is... 4 divide 60? Which is 0.06?

[Unknown008]

Hm... not quite.

What you got is the speed in km/min

Convert into hours as you were asked now.

In 1 minute, he covers 0.06666 km
In 60 minutes, he covers 0.06666 x 60 = 4 km/hr

[Eloisea1]

3.9996? I am confused :S

[Unknown008]

Right, but you didn't take all the numbers.

The actual distance he covers in 1 minute is

Multiply that by 60, to get:

[Eloisea1]

So is it 4km/h?

[Unknown008]

Yes it is :)

[Eloisea1]

Thank you , and possibly 1 last question? I have posted it on average speed 3 , and have used what you taught me , darren ran a 200m race in 24 seconds what was his average speed for the race in m/s? Is it 8.3m/s and his av sp in km/h 20.88 km/h

[Eloisea1]

a. Darren ran a 200m race in 24 seconds. What was his average speed for the race in m/s. Is it 8.3? And also I have to find his average speed in km/h. can anyone help with both questions please?

[Unknown008]

i have posted it on average speed 3 , and have used what you taught me , darren ran a 200m race in 24 seconds what was his average speed for the race in m/s? Is it 8.3m/s and his av sp in km/h 20.88 km/h

1. Right
2. Not quite...

200 m = 0.2 km
24 s =

So, speed =

Or from you initial speed: