A man walks at 5 kmph for 6 hrs and at 4 kmph for 12 hrs. His average speed is Choose the correct choice:  A) 4 1/3 km/h  B) 7 2/3 km/h  C) 9 ½ km/h  D) 8 km/h  E) 81 km/h
4 1/3 km/hvg speed = total distance/total time   = 5*6 + 4*12 / 18   =4 1/3 km/h
<result>A</result>
A man walks at 5 kmph for 6 hrs and at 4 kmph for 12 hrs. His average speed is