Answers

The Brainliest Answer!
2014-06-26T20:09:40+05:30
Average speed =total distance /time
let the distance travelled from A to B= x km
then,
total distance travelled = 2x km
time while going from A to B = D/S
                                             =x/30 hours
time while returning = x/50 hours
total time = x/30 + x/50
                =5x+ 3x 
                    150
                 =8x/150
                  =4x/75 hours
average speed = 2x x 75
                                   4x
                            37.5 km/hr
      
                
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