Oliver travelled for 15 hours. He covered the first half of the distance at 40 kmph and remaining half of the distance at 45 kmph. Find the distance travelled by Oliver? Choose the correct option:
A) 280 km	B) 634 km	C) 760 km	D) 720 km	E) 612 km
Let the distance travelled be x km.   Total time = (x/2)/40 + (x/2)/45 = 15 =&gt; x/80 + x/90   = 15 =&gt; (9x + 8x)/720 = 15 =&gt; x   = 720 km   Answer: 720 km
<result>D</result>
Oliver travelled for 15 hours. He covered the first half of the distance at 40 kmph and remaining half of the distance at 45 kmph. Find the distance travelled by Oliver?