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November 22, 2017, 08:21:15 PM
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: Average speed of the car!  ( 3515 )
« : June 19, 2007, 08:53:28 PM From Ria»



Average speed of the car!


There's a square racetrack 1km on each side. A car starts from a corner and moves on the first & second sides at 60kmph and on the third side at 30kmph. what should be it's speed on the last side so that the average for the whole journey is 60kmph?

 
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« #1 : June 20, 2007, 12:55:39 AM From PSM»

is it 90kmph?
i think...it is right....well i'm gettin confused because it was too easy.....giving a fear that i might be doing somthing wrong....... :-\
« #2 : July 16, 2007, 11:31:32 PM From Ria»

PSM, 60 mph is incorrect.

Average speed = (Total distance)/(Total time).
« #3 : August 30, 2007, 08:22:15 PM From jigar_er_civil»

not possible , this sum already given in Times of India
« #4 : September 13, 2007, 11:17:47 AM From vishwakarma.deepak»

It's not possible to atain average of 60 as time has run out after third side...so to make it by 60  the car should cover fourth side with no time...that's not feasible...


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