The speed of the boat in still water in 12 kmph. It can travel downstream through 39 kms in 3 hrs. In what time would it cover the same distance upstream?	Choose the correct choice from the following:
A) 3.5 hours
B) 6 hours
C) 4 hours
D) 5 hours
E) 6 hours
Still Water=12km/hr   Downstream=39/3= 
<gadget id="calculator">39/3</gadget>
<output>13</output>
13km/hr   Upstream=&gt;&gt; still water=(u+v/2) =&gt;&gt; 12=u+13/2 = 11km/hr   So time taken in upstream = 39/11 =3.5hrs   3.5 hoursNSWER:3.5 hours
<result>A</result>
The speed of the boat in still water in 12 kmph. It can travel downstream through 39 kms in 3 hrs. In what time would it cover the same distance upstream?