A man travelled from the village to the post office at the rate of 10kmph and walked backed at the rate of 5 kmph. If the whole journey took 3hours, find the distance of the post office from the village? Select the correct option:	A) 10km	B) 15km	C) 20km	D) 25km	E) 30km
10kmverage speed = 2xy/x+y = 2*10*5/10+5 = 20/3km/hr   Distance travelled in 3hours = 20/3 * 3= 
<gadget id="calculator">20/3 * 3</gadget>
<output>20</output>
20km   Distance of the post office from the village= 20/2= 
<gadget id="calculator">20/2</gadget>
<output>10</output>
10km   10kmnswer is 10km
<result>A</result>
A man travelled from the village to the post office at the rate of 10kmph and walked backed at the rate of 5 kmph. If the whole journey took 3hours, find the distance of the post office from the village?