in one hour, a boat goes 19 km along the stream and 5 km against the stream. the speed of the boat in still water ( in km / hr ) is:	Pick one.
A) 2
B) 4
C) 7
D) 12
E) 15
<gadget id="calculator">19 + 5</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>D</result>
in one hour, a boat goes 19 km along the stream and 5 km against the stream. the speed of the boat in still water ( in km / hr ) is:
divide(add(19, 5), const_2)
"sol . speed in still water = 1 / 2 ( 19 + 5 ) kmph = 12 kmph . answer d"