A boat travels 40 km downstream in 8 hours and 36 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.
Choose the correct answer
A) 8 km/hr, 1 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=40km/8hrs   =5kmph   upstream speed40  /8= 
<gadget id="calculator">40  /8</gadget>
<output>5</output>
5kmph   upstream speed=36km/12hrs   =3kmph   speed of boat36  /12= 
<gadget id="calculator">36  /12</gadget>
<output>3</output>
3kmph   speed of boat=avg of downstream and upstream speeds   speed of boat=(5+3)/2= 
<gadget id="calculator">(5+3)/2</gadget>
<output>4</output>
4kmph.   current speed=half of the difference of downstream and upstream speeds   currend speed=(5-3)/2= 
<gadget id="calculator">(5-3)/2</gadget>
<output>1</output>
1kmph   ans is 4km/hr,1km/hr   ANSW4 km/hr, 1 km/hrR:4 km/hr, 1 km/hr
<result>E</result>
A boat travels 40 km downstream in 8 hours and 36 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current.