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- anonymous

A car travels 100 meters in 5 seconds. What is the speed of the car?
speed = distance over time; 1 mile = 1609 meters

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- anonymous

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- anonymous

i need a walk through

- Michele_Laino

by definition, the speed of the car is:
\[\Large speed = \frac{{{\text{distance}}}}{{{\text{time}}}}\]

- anonymous

100 miles is distance and

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- anonymous

5 secs is time

- anonymous

So how much is 100m in miles?? 100/1609 right? :D And how much is 5 seconds in hours? 5/3600 right? :D So miles/hour = \[\frac{ 100 }{ 1609 }*\frac{ 3600 }{ 5 }\] 44.7 miles

- campbell_st

if you multiply both values by 12 you will know how many metres in 1 minute
this is because 12 x 5 = 60
then multiply the answer by 60 to find how many metres in 1 hour
does that make sense..?

- Michele_Laino

\[\Large speed = \frac{{{\text{distance}}}}{{{\text{time}}}} = \frac{{100}}{5} = ...miles/\sec \]

- anonymous

20

- Michele_Laino

correct! it is 20 miles/seconds

- anonymous

????

- Michele_Laino

we can change unit of measure, namely we can measure that speed in Km/hour

- anonymous

so 20 is the right answer not what they said?

- Michele_Laino

20 miles /seconds, is your speed, and as you can see , the corresponding unit of measure is miles/seconds

- Michele_Laino

nevertheless, if we want to change unit of measure, of course, we get a different answer

- anonymous

20

- anonymous

so thats all i had to do

- anonymous

@Buttercup214 its 20

- Michele_Laino

yes! if you want the speed in miles/seconds, that is all!

- anonymous

oh sorry i forgot to say thank you.

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