A boat travels 80 km downstream in 8 hours and 60 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.	Pick one
A) 7.5 km/hr, 2.5 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=60km/12hrs   =5kmph   speed of boat60  /12= 
<gadget id="calculator">60  /12</gadget>
<output>5</output>
5kmph   speed of boat=avg of downstream and upstream speeds   speed of boat=(10+5)/2= 
<gadget id="calculator">(10+5)/2</gadget>
<output>15/2 = around 7.5</output>
7.5kmph.   current speed=half of the difference of downstream and upstream speeds   currend speed=(10-5)/2= 
<gadget id="calculator">(10-5)/2</gadget>
<output>5/2 = around 2.5</output>
2.5kmph   ans is 7.5km/hr, 2.5km/hr   7.5 km/hr, 2.5 km/hrNSWER:7.5 km/hr, 2.5 km/hr
<result>A</result>
A boat travels 80 km downstream in 8 hours and 60 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.