A boat travels 80 km downstream in 8 hours and 48 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current. Pick.
A) 7 km/hr, 3 km/hr	B) 5 km/hr, 4 km/hr	C) 1 km/hr, 6 km/hr	D) 2 km/hr, 1 km/hr	E) 4 km/hr, 1 km/hr
Downstream speed=80km/8hrs   =10kmph   upstream speed80  /8= 
<gadget id="calculator">80  /8</gadget>
<output>10</output>
10kmph   upstream speed=48km/12hrs   =4kmph   speed of boat48  /12= 
<gadget id="calculator">48  /12</gadget>
<output>4</output>
4kmph   speed of boat=avg of downstream and upstream speeds   speed of boat=(10+4)/2= 
<gadget id="calculator">(10+4)/2</gadget>
<output>7</output>
7kmph.   current speed=half of the difference of downstream and upstream speeds   currend speed=(10-4)/2= 
<gadget id="calculator">(10-4)/2</gadget>
<output>3</output>
3kmph   ans is 7km/hr,3km/hr   7 km/hr, 3 km/hrNSWER:7 km/hr, 3 km/hr
<result>A</result>
A boat travels 80 km downstream in 8 hours and 48 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.