URGENT- Need help with Maths GCSE

In the topic 'Real life graphs' how do you answer the ending question(s) where it states something in the line of 'work out their average speed'? Please help

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Reply 1

aadil10

Original post by b.l

In the topic 'Real life graphs' how do you answer the ending question(s) where it states something in the line of 'work out their average speed'? Please help

could you post or link an exact question?

Reply 2

b.l

Original post by aadil10

could you post or link an exact question?

Reply 3

aadil10

Original post by b.l

last question?

Reply 4

metrize

Original post by b.l

In the topic 'Real life graphs' how do you answer the ending question(s) where it states something in the line of 'work out their average speed'? Please help

Use speed = distance/time
Then look on the graph for distance and time, and substitute it in

Reply 5

b.l

Original post by metrize

Use speed = distance/time
Then look on the graph for distance and time, and substitute it in

I tried that but I can't seem to get the correct answer? Could you try the last question and tell me what answer you got please?

Reply 6

b.l

Original post by aadil10

last question?

yep

Reply 7

metrize

Original post by b.l

I tried that but I can't seem to get the correct answer? Could you try the last question and tell me what answer you got please?

Ok one second

EDIT:
E) 20/0.5=40km/h
F) 20/(2/3)=20*3/2=30km/h

(edited 8 years ago)

Reply 8

aadil10

Original post by b.l

I tried that but I can't seem to get the correct answer? Could you try the last question and tell me what answer you got please?

Start of return journey is 11:10, end is 11:50 so time taken is 40min

Time = 40min = 2/3 hour (need correct units)

Distance = 20km

Speed = Distance/Time = 20/ 2/3 = 30km/h

Reply 9

b.l

[QUOTE=metrize;56548635]Ok one second

EDIT:
E) 20/0.5=40km/h
F) 20/(2/3)=20*3/2=30km/h
Omg thankyou so much! Your answers are correct, could you just explain how you went through each stage i was confusing myself. How did you get 0.5 etc. i appreciate this so much because its very likely that it'll come up

Reply 10

b.l

Original post by aadil10

Start of return journey is 11:10, end is 11:50 so time taken is 40min

Time = 40min = 2/3 hour (need correct units)

Distance = 20km

Speed = Distance/Time = 20/ 2/3 = 30km/h

Thankyou for your reply but the answer says it is 40km?

Reply 11

aadil10

Original post by b.l

Thankyou for your reply but the answer says it is 40km?

my answer is for the last question (average speed is in km/h)

Reply 12

b.l

Original post by aadil10

my answer is for the last question (average speed is in km/h)

Oh sorry forgot to put the '/h' in

Reply 13

b.l

[QUOTE=metrize;56548635]Ok one second

EDIT:
E) 20/0.5=40km/h
F) 20/(2/3)=20*3/2=30km/h. Please??

Reply 14

aadil10

Original post by b.l

Oh sorry forgot to put the '/h' in

part E) is 40km/h

my answer for F) is right

Reply 15

metrize

Original post by b.l

Omg thankyou so much! Your answers are correct, could you just explain how you went through each stage i was confusing myself. How did you get 0.5 etc. i appreciate this so much because its very likely that it'll come up

Sorry, only checked TSR now.

It was 0.5, as the journey took 30 minutes (from doing the time she reached take away the time she started)
30 minutes in hours is 1/2 (or 0.5) as you have to put it in km/h so the units have to kilometres and hours.

For the second one, I got it was 40 minutes by using the graph so 40/60 = 4/6 = 2/3
Then you substitute the distance which is 20

20 DIVIDE 2/3 so to divide fractions you find the reciprocal of the 2nd one and multiply it instead, so it becomes 20 MULTIPLY 3/2 = 60/2 = 30

(edited 8 years ago)

Reply 16

b.l

[QUOTE=metrize;56550693]Sorry, only checked TSR now.

It was 0.5, as the journey took 30 minutes (from doing the time she reached take away the time she started)
30 minutes in hours is 1/2 (or 0.5) as you have to put it in km/h so the units have to kilometres and hours.

For the second one, I got it was 40 minutes by using the graph so 40/60 = 4/6 = 2/3
Then you substitute the distance which is 20

20 DIVIDE 2/3 so to divide fractions you find the reciprocal of the 2nd one and multiply it instead, so it becomes 20 MULTIPLY 3/2 = 60/2 = 30
Thankyou soo much! I appreciate it.. Feel a bit more confident thanks to you :smile: