In a race u drove 1st lap with 40kmph and in the second lap at what speed u must drive so that your average speed must be 80kmph.
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total number of laps = 2
Average =(x+y)/2
(40+y)/2= 80
40+y = 160
y = 160-40
y = 120kmph
Average =(x+y)/2
(40+y)/2= 80
40+y = 160
y = 160-40
y = 120kmph
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