Question

AN AVERAGE SPEED OF AN OBJECT OVER A GIVEN TIME DURATION IS 6M/S. IF IT TRAVELS FIRST HALF OF DURATION WITH A CONSTATNT SPEED 4M/S.ITS SPEED DURING THE NEXT HALF DURATION IS.

Answer 1

So there the time is split into 2 parts. for first 4 m/s for second we can assume
'x' m/s 

Then, 
         4+x/2=6
         x=12-4
         x= 8 m/s