If average speed of a car is 42km/h and its speed for the first 15 minutes is 50km/h.What will be its speed in the next 15 minutes
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average speed= s1+s2/2
so 42=50+x/2
hence,84=50+x
therefore,x=84-50=34
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so 42=50+x/2
hence,84=50+x
therefore,x=84-50=34
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