The speed of a boat in still water is 70kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?  Select:
A) 22 kmph B) 40 kmph C) 78 kmph D) 50 kmph E) 23 kmph
Speed downstream = 70 + 20= 
<gadget id="calculator">70 + 20</gadget>
<output>90</output>
90 kmph   Speed upstream= 70 - 20= 
<gadget id="calculator">70 - 20</gadget>
<output>50</output>
50 kmph   Answer:50 kmph
<result>D</result>
The speed of a boat in still water is 70kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?