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The time needed to drive : Quantitative Comparison Questions

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The time needed to drive [#permalink]
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With all respect for your tutor sir I do think a tutor should teach BEFORE to think critically and then, among your tolls, to pick numbers to solve the problem faster

However, thinking critically comes before


The formula for rate/time /distance is

D = R*T

T=D/R

Now

QA is \(T=\frac{a}{\frac{b}{a}}\) >>>> \(\frac{a^2}{b}\)

QB is \(T=\frac{\frac{b}{a}}{\frac{b}{1}} >>>\frac{ b}{a} * \frac{1}{b }>>> \frac{b}{ab} >>> \frac{1}{a}
\)

Now, if we confront the two quantities \(\frac{a^2}{b}=\frac{1}{a}\)

so cross multiply because we do know that the numbers must be positive

\(a^3=b\)

which numbers give us the equivalence above . We do not know

0=0 but also 1=1

The answer is D
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Re: The time needed to drive [#permalink]
Carcass wrote:
With all respect for your tutor sir I do think a tutor should teach BEFORE to think critically and then, among your tolls, to pick numbers to solve the problem faster

However, thinking critically comes before


The formula for rate/time /distance is

D = R*T

T=D/R

Now

QA is \(T=\frac{a}{\frac{b}{a}}\) >>>> \(\frac{a^2}{b}\)

QB is \(T=\frac{\frac{b}{a}}{\frac{b}{1}} >>>\frac{ b}{a} * \frac{1}{b }>>> \frac{b}{ab} >>> \frac{1}{a}
\)

Now, if we confront the two quantities \(\frac{a^2}{b}=\frac{1}{a}\)

so cross multiply because we do know that the numbers must be positive

\(a^3=b\)

which numbers give us the equivalence above . We do not know

0=0 but also 1=1

The answer is D



Yeah, your explanation make sense. But aint time and distance always positive? What is the meaning of -10S or -10 m?
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The time needed to drive [#permalink]
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The Lamborghini runs from 0 to 300km in less than 3 seconds. So I guess rate and distance are always positive on the number line

Never seen a car that went from 0 to 300km in -3 seconds. Do you ?? ;)
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Re: The time needed to drive [#permalink]
Carcass wrote:
The Lamborghini runs from 0 to 300km in less than 3 seconds. So I guess rate and distance are always positive on the number line

Never seen a car that went from 0 to 300km in -3 seconds. Do you ?? ;)



If they are positive (except 0), why cant we pick the random number :D
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Re: The time needed to drive [#permalink]
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kumarneupane4344 wrote:
Carcass wrote:
The Lamborghini runs from 0 to 300km in less than 3 seconds. So I guess rate and distance are always positive on the number line

Never seen a car that went from 0 to 300km in -3 seconds. Do you ?? ;)



If they are positive (except 0), why cant we pick the random number :D


Yes but the car could be stuck so the Distance is zero :lol: :D
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Re: The time needed to drive [#permalink]
1
Carcass wrote:
kumarneupane4344 wrote:
Carcass wrote:
The Lamborghini runs from 0 to 300km in less than 3 seconds. So I guess rate and distance are always positive on the number line

Never seen a car that went from 0 to 300km in -3 seconds. Do you ?? ;)



If they are positive (except 0), why cant we pick the random number :D


Yes but the car could be stuck so the Distance is zero :lol: :D


Haha, I did not think in that way. Anyway, You are The BEST in the world sir :heart :heart :inlove: :please:
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Re: The time needed to drive [#permalink]
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