Ok, I'm doing a Mock End of Unit Test Revision paper and I'm stuck on a few questions.
The first question is:
Susan completes the journey in $2$ stages of her journey. In stage 1 of her journey, she drives at an average speed of $80$km/h and takes $1$ hour and $45$ minutes.
(a) How far does she travel?
I know that answer is $140$ because:
$1$ hour $=$ $80$km/h
A quarter of $80$ ($15$ minutes) is $20$ and I need three-quarters as there's $45$ minutes which is $60$.
$80$ $+$ $60$ $=$ $140$. I know it's the right answer however how come on the Marking Paper the method of working it out is doing $80$ x $1.75$. Where do you get $1.75$ from?
Altogether Susan travels $190$km/h and takes the total time of $2$ hours and $15$ minutes.
(b) What is her average speed, in km/h, in stage $2$ of her journey?
I know that you would start of by doing $190$ $-$ $140$ = $50$. I'm not sure what to do after that though. Thanks everyone, I know it seems quite easy.