The speed of a boat in still water is 8km/hour. If it can travel 1 km upstream in 1 hourr, what time it would take to travel the same distance downstream?  Options
A) 2 minutes
B) 4 minutes
C) 6 minutes
D) 7 minutes
E) 8 minutes
Speed of the boat in still water = 8 km/hr   Speed upstream =11 = 1 km/hr   Speed of the stream = 8-1= 
<gadget id="calculator">8-1</gadget>
<output>7</output>
7 km/hr   Speed downstream= (8+7)= 
<gadget id="calculator">(8+7)</gadget>
<output>15</output>
15 km/hr   Time taken to travel 1 km downstream=115 hr = 1×6015= 4 minutes   4 minutes
<result>B</result>
The speed of a boat in still water is 8km/hour. If it can travel 1 km upstream in 1 hourr, what time it would take to travel the same distance downstream?