The speed of the boat in still water is 12km/hr. and the speed of the stream is 3km/hr. Find the distance travelled downstream in 12 minutes. Choose one:  A) 160 km  B) 180 km  C) 190 km  D) 170 km  E) 140 km
speed of the boat in downstream =speed of the water + speed of the boat   =12+3= 
<gadget id="calculator">12+3</gadget>
<output>15</output>
15km/hr Distance travelled in 12 minutes=15 *12= 
<gadget id="calculator">15 *12</gadget>
<output>180</output>
180km. Answer : 180 km
<result>B</result>
The speed of the boat in still water is 12km/hr. and the speed of the stream is 3km/hr. Find the distance travelled downstream in 12 minutes.