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 one
A) 2 hours	B) 3 hours	C) 4 hours	D) 5 hours	E) None of these
Solution   Speed downstream = 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>C</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.