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September 25th, 2016, 10:39 AM   #11
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Not necessarily. The question asked you to work out how many cars pass the house in a minute, not the average interval. As 20 cars pass in 10 minutes, 2 cars pass per minute (on average). One minute is a tenth of 10 minutes, so you get the answer by dividing both numbers by 10 (or by multiplying each number by 0.1).
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September 30th, 2016, 07:32 PM   #12
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It is a rather simple problem which I cannot find an easier solution to.

20 cars pass a house within 10 minutes. Work out how many cars pass the house in a minute.

20/10 = 2 cars per minute
You have answered the "rather simple problem" right there. It's 2 cars per minute. Why complicate it further?

(Oops. Just as I tried to post, Skipjack beat me to the punch).

Last edited by Timios; September 30th, 2016 at 07:35 PM. Reason: Skipjack posted first
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September 30th, 2016, 11:44 PM   #13
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According to problem,
time taken by 20 cars to pass the house = 10 minutes
Now, you want to calculate the time to pass the house taken by 1 car.
so, time taken by 1 car to pass the house = $\displaystyle \dfrac{10}{20} minutes$
$\displaystyle =\dfrac{1}{2} minutes$
If you want to calculate time in seconds, you need to change the minutes into seconds,
since 1 minute = 60 seconds
therefore $\displaystyle \dfrac{1}{2} minutes=60\times\dfrac{1}{2}$
=30 seconds
Thus, time taken by 1 car to pass the house = 30 seconds.
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