If a boat is rowed downstream for 24 km in 4 hours and upstream for 48 km in 24 hours, what is the speed of the boat and the river?
Pick one.
A) 4 , 3
B) 4 , 4
C) 3 , 3
D) 4 , 5
E) 4 , 2
4 , 2xplanation:   If x: speed of boats man in still water   y: speed of the river   Downstream speed (Ds) = x + y   Upstream speed (Us) = x â€“ y   x = (Ds + Us) / 2   y = (Ds â€“ Us) / 2   In the above problem Ds = 6 ; Us = 2   x = (6 + 2) / 2 = 8/2= 
<gadget id="calculator">8/2</gadget>
<output>4</output>
4 km/hr   y= (6 - 2)/2 = 4/2= 
<gadget id="calculator">4/2</gadget>
<output>2</output>
2 km/hr   ANSW4 , 2R: 4 , 2
<result>E</result>
If a boat is rowed downstream for 24 km in 4 hours and upstream for 48 km in 24 hours, what is the speed of the boat and the river?