By: Mike
“When machine A is working alone, it takes 64 extra minutes. Why? Because there is work leftover after t minutes. The work that would have been done by machine B in t minutes is leftover and is done by...
View ArticleBy: Karishma
Sure. Say, Mike and Molly start painting a fence together. They paint at their own respective speeds. They take 2 hrs to finish the job together. If Mike works alone, he takes 3 hrs to finish the job....
View ArticleBy: Mike
Hi Karishma, Thank you so much for taking your time to help me understand this concept. I love how you use my name in the example to make it more personal. You are AWESOME! :o)
View ArticleBy: Mark
I’m sorry, but I think that #3 is dead wrong. There are 2 ways to interpret the last sentence of the question “What is the ratio of the time taken by machine A to the time taken by machine B to...
View ArticleBy: Gaurav
Hi karishma, Thanks for the brilliant post as always. Could you mind to tell how to solve the below problem with such an approach? Tom, working alone, can paint a room in 6 hours. Peter and John,...
View ArticleBy: Gaurav
Got it!! rates of A:B:C= 1/6:1/3:1/2= 1:2:3 rate of a= 1/(1+2+3)=1/6 rate of b= 2/6 rate of c=3/6 so in 2 hrs. work done by a=1/6*2=1/3 In the second hour ,work done by b =1/3*1=1/3 So total work...
View ArticleBy: Karishma
We say rate of A is 1/6 when A completes a work in 6 hrs. The reason is the the unit of rate is work/time = 1 work/6 hrs. So basically, when we say that A’s rate is 1/6, it implies that A completes...
View ArticleBy: Karishma
Tom’s rate = 1/6 Peter’s rate = 1/3 John’s rate = 1/2 In 1 hr, Tom completes 1/6th of the work and you have 5/6 leftover. In the next hr, Tom and Peter do 1/6 + 1/3 = 1/2 of the work and now 5/6 – 1/2...
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