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khalidd
 Post subject: challenging......
PostPosted: Thu, 2 Sep 2010 07:59:42 UTC 
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a car covers 450km at a constant speed.if the speed would have been increased by
15km/h the time taken would have been 90mints less.what is the speed of the car.
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aswoods
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PostPosted: Thu, 2 Sep 2010 10:07:33 UTC 
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Joined: Mon, 23 Feb 2009 23:20:33 UTC
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Location: Adelaide, Australia
If it is travelling at a constant speed of v km/h, it will take 450/v hours to cover the distance. And 90 minutes is equal to 3/2 hours.

$\frac{450}{v}=\frac32+\frac{450}{v+15}
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