A ship can travel with aspeed of 10km/hr in still water. If the speed of the stream is 10km/hr, find the time taken by the boat to go 60km downstream.  Options.
A) 3 hrs	B) 5 hrs	C) 6 hrs	D) 7 hrs	E) 9 hrs
Speed downstream = (10 + 10) km/hr = 45 km/hr.   Time taken to travel 68 km downstream = 60/20= 
<gadget id="calculator">60/20</gadget>
<output>3</output>
3 hrs.   3 hrs
<result>A</result>
A ship can travel with aspeed of 10km/hr in still water. If the speed of the stream is 10km/hr, find the time taken by the boat to go 60km downstream.