P is faster than Q. P and Q 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, P's speed is equal to ?  Options.
A) 9 km/hr	B) 4 km/hr	C) 6 km/hr	D) 5 km/hr	E) 3 km/hr
Explanation:   Let P's speed = x km/hr. Then, Q's speed = (7 - x) km/ hr.   So, 24/x + 24/(7 - x) = 14   - 98x + 168 = 0   (x - 3)(x - 4) = 0 =&gt; x = 3 or 4.   Since, P is faster than Q,   so P's speed = 4 km/hr and Q's speed = 3 km/hr.   Answer: 4 km/hr
<result>B</result>
P is faster than Q. P and Q 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, P's speed is equal to ?