The speed of a boat in still water is 50kmph and the speed of the current is 20kmph. Find the speed and upstream?  Choose the correct option:
A) 30 kmph
B) 40 kmph
C) 78 kmph
D) 15 kmph
E) 23 kmph
Speed downstream = 50 + 20= 
<gadget id="calculator">50 + 20</gadget>
<output>70</output>
70 kmph   Speed upstream= 50 - 20= 
<gadget id="calculator">50 - 20</gadget>
<output>30</output>
30 kmph   30 kmphnswer:30 kmph
<result>A</result>
The speed of a boat in still water is 50kmph and the speed of the current is 20kmph. Find the speed and upstream?