A is faster than B. A and B each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, A's speed is equal to?  Choose the correct choice from the following
A) 12 km/hr  B) 3 km/hr  C) 17km/hr  D) 16km/hr  E) 19km/hr
Let A's speed = x km/hr. Then, B's speed = (7 - x) km/ hr.   So, 24/x + 24/(7 - x) = 14   x2 - 98x + 168 = 0   (x - 3)(x - 4) = 0 =&gt; x = 3 or 4.   Since, A is faster than B, so A's speed = 4 km/hr and B's speed   = 3 km/hr.   Answer:3 km/hr
<result>B</result>
A is faster than B. A and B each walk 24 km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, A's speed is equal to?