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The faster a car is traveling, the less time the driver

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Re: The faster a car is traveling, the less time the driver has to avoid a [#permalink]

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New post 31 Aug 2016, 20:38
TheLordCommander wrote:
shasadou wrote:
I am still calling into question the reasoning behind answers B and D. As for D: the stem has already told us the fatality/mile rate dropped - so it is given, there ARE factors that either impact the numerator or denominator or both - D completes the picture/explains by saying that the denominator increased. Here we are sort of forced to make a slight assumption that the fatality number should have risen at most at a lower rate than the milage driven for the equation to hold true. BUT the stem clearly says the rate is down, it is guaranteed ---> so combined with answer D we get the full picture.

As for A: I can find a number of reasons to challenge B. Automakers are lying (as we see with many recent cases) to consumers as regards features of the cars - so wearing a seatbelt does not result into a saved life. I have a friend who luckily avoided a fatality although the airbag did not jump out as should have as per the car specifications. All the people who wear seatbelts can be driving old rusty cars where seatbelt does not hold. There are numerous ways to challenge the B. If we accept the B as the right answer then we should accept that we also are making an additional assumption to make the B true: that the seatbelts and airbags are really working.

Completely agree with you. For B to be true, it has to be assumed that seatbelts and aribags do work. I was under the impression that it is not right to assume anything out of what is stated in the answer choices in CR. Apparently it is not so... Also, seatbelts' utility is not obvious or general knowledge, such as water being transparent. Weird answer.

You don't need to "assume" that seatbelts and airbags work! They do! Note that option (B) clearly says "people who wore seat belts". So more people have started wearing seat belts. If a car has air bags, they will get deployed on their own so they are not dependent on people using them. They both add to the safety of the car.
They might malfunction in some rare cases but mostly they work.
If I say, "I bought him a new laptop," isn't it implied that he can use the laptop when he wants. Would I say I am assuming too much? That I should consider that the laptop may not work?

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Re: The faster a car is traveling, the less time the driver [#permalink]

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New post 17 Jan 2018, 10:27
VeritasPrepKarishma wrote:
truongynhi wrote:
Hi Karishma,

How could we know that the fatality rate (or the number of fatalities) will increase proportionally with the increase in mileage driven?

In my flawed reasoning, I just simply put the increased denominator, which is the mileage driven (assuming the same number of cars), in the rate formula and consequently concluded that fatality rate increases.

Please correct me. Really appreciate your help.

The point is that fatality rate per highway mile driven does not change if the number of miles driven increases. It is something like this:

Say my speed is 60 miles/hr. I maintain this speed. Does it matter whether I drive for 2 hours at this rate or 4 hours at this rate? Will my speed change if I drive more? No, right? When I drive for more hours, the distance I covered increases.

Similarly, fatality rate per highway mile is a rate which will not change with the change in the number of highway miles driven. If more highway miles are driven, the number of fatalities increase.

Passage - If high speed then fatality will surely happen {among other things equal} 'a general truth sort of thing.

Question stem asks why fatality rate decreased inspite of increase in speed ?

Option D says about avg . mileage driven by cars increased. So it means that per car started travelling more on increased speed which in turn signifies that more travel more fatality. So indirectly it is not solving the paradox but rather restating the premise in a different way. Until we dont bring some external factor into picture as has been brought by option B then fatality cannot be reduced because it is bound to happen if travelling more on high speeds.

Now few contributors have expressed doubt that the ratio of FATALITY / MILES DRIVEN has reduced in option D but in thinking they are indirectly assuming that no fatality is taking place by driving more at high speed.

Re: The faster a car is traveling, the less time the driver   [#permalink] 17 Jan 2018, 10:27

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