a boat can travel with a speed of 15 km / hr in still water. if the speed of the stream is 6 km / hr, find the time taken by the boat to go 86 km downstream.	Answers.
A) 4.1 hr
B) 5.25 hr
C) 8.25 hr
D) 2.25 hr
E) 2.50 hr
<gadget id="calculator">15 + 6</gadget>
<output>21</output>

<gadget id="calculator">86 / 21</gadget>
<output>86/21 = around 4.095238</output>

<result>A</result>
a boat can travel with a speed of 15 km / hr in still water. if the speed of the stream is 6 km / hr, find the time taken by the boat to go 86 km downstream.
divide(86, add(15, 6))
"speed of boat in still water = 15 km / hr speed of the stream = 6 km / hr speed downstream = ( 15 + 6 ) = 21 km / hr time taken to travel 86 km downstream = 86 â  „ 16 = 17 â  „ 4 = 4.1 hours answer is a"