A dog travelled for 2 hours. He covered the first half of the distance at 10 kmph and remaining half of the distance at 5 kmph. Find the distance travelled by the dog? Choose the correct choice from the following options:	A) 20 km	B) 16 km	C) 6 km	D) 3 km	E) 61 km
Let the distance travelled be x km.   Total time = (x/2)/10 + (x/2)/5 = 2 =&gt; x/20 + x/10   = 2 =&gt; (1x + 2x)/20 = 2 =&gt; x   = 20 km   20 kmnswer: 20 km
<result>A</result>
A dog travelled for 2 hours. He covered the first half of the distance at 10 kmph and remaining half of the distance at 5 kmph. Find the distance travelled by the dog?