A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Choose the correct choice from the following answers.
A) 2 hours	B) 1 hours	C) 7 hours	D) 4 hours	E) 3 hours
Speed downstream = (13 + 4) km/hr = 17 km/hr.   Time taken to travel 68 km downstream = 68/17= 
<gadget id="calculator">68/17</gadget>
<output>4</output>
4 hrs.   ANSWER:4 hours
<result>D</result>
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.