
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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September 25th, 2016, 10:39 AM  #11 
Global Moderator Joined: Dec 2006 Posts: 16,919 Thanks: 1253 
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).

September 30th, 2016, 07:32 PM  #12  
Senior Member Joined: Jan 2014 From: The backwoods of Northern Ontario Posts: 367 Thanks: 68  Quote:
(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  
September 30th, 2016, 11:44 PM  #13 
Newbie Joined: Sep 2016 From: kota Posts: 8 Thanks: 4 
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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