If one person completes a journey in 10 hrs. He travels 1st half of the journey at the rate of 21 km/hr and 2nd half at therate of 24 km/hr. Find the total journey in km.	Options:
A) 189 km
B) 210 km
C) 224 km
D) 256 km
E) 274 km
distance = speed x time   Let time taken to travel the first half = x hr   then time taken to travel the second half = (10 - x) hr   Distance covered in the the first half = 21x   Distance covered in the the second half = 24(10 - x)   But distance covered in the the first half = Distance covered in the the second half   =&gt; 21x = 24(10 - x)   =&gt; 21x = 240 - 24x   =&gt; 45x = 240   =&gt; 9x = 48   =&gt; 3x = 16   ⇒x=163Hence Distance covered in the the first half = 21x=21×163=7×16=112 kmTotal distance = 2×112=224 km   224 km
<result>C</result>
If one person completes a journey in 10 hrs. He travels 1st half of the journey at the rate of 21 km/hr and 2nd half at therate of 24 km/hr. Find the total journey in km.