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Summarising and analysing data

This topic has 3 replies, 2 voices, and was last updated 3 years ago by John Moffat.

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April 7, 2021 at 11:14 am #616227
sejazkhan
Participant
- Topics: 1
- Replies: 12
A car travels 20 miles at 30mph, then 10 miles at 60 mph
What is the mean speed for the whole journey of 30 miles?
Ans: 36
Kindly explain
April 7, 2021 at 2:59 pm #616260
John Moffat
Keymaster
- Topics: 57
- Replies: 54500
The first 20 miles will take 20/30 x 60 = 40 minutes
The next 10 miles will take 10/60 x 60 = 10 minutes
So the total time for 30 miles is 50 minutes.
Therefore the average speed is 60/50 x 30 = 36 miles per hour
April 8, 2021 at 9:02 am #616325
sejazkhan
Participant
- Topics: 1
- Replies: 12
Thanks
April 8, 2021 at 9:45 am #616335
John Moffat
Keymaster
- Topics: 57
- Replies: 54500
You are welcome 🙂
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