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athudi1507
why i didnt get c­
as c is saying diesel car faced more resistance of wind
­I've added more to my explanation for (C). See whether you get why (C) is correct now, and if you have further questions, please let me know.
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GMATNinja if there is more wind resistance wont it be difficult to drive the car and hence requiring more fuel to pump . Wont it weaken option C ?
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rmahe11
GMATNinja if there is more wind resistance wont it be difficult to drive the car and hence requiring more fuel to pump . Wont it weaken option C ?
Take a closer look at the conclusion:

Quote:
Clearly, the diesel engine is more fuel-efficient than the gasoline engine.
If we were talking about the overall fuel efficiency of the cars, you'd have a valid point. But the conclusion is only concerned with the fuel efficiency of the engines. Maybe if the two cars swap engines, the car that was initially diesel-powered would still use more fuel.

In other words, for all we know, the diesel engine is just as fuel-efficient, or perhaps even MORE fuel-efficient, than the gasoline engine. But the wind resistance adds another variable to the experiment.

I hope that helps!
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