Speed downstream = 50 + 20 = 70 kmph
Speed upstream = 50 - 20 = 30 kmph
The speed of a boat in still water is 50kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?
  * 40, 68 kmph
  * 40, 30 kmph
  * 70, 30 kmph
  * 40, 60 kmph
  * 20, 60 kmph