Two trains start from P and Q respectively and travel towards each other at a speed of 50 km/hr and 40 km/hr respectively. By the time they meet, the first train has traveled 100 km more than the second. The distance between P and Q is?	Choose the correct choice from the following answers:
A) 767 km
B) 975 km
C) 678 km
D) 900 km
E) 546 km
At the time of meeting, let the distance traveled by the second train be x km. Then, distance covered by the first train is (x + 100) km.   x/40 = (x + 100)/50   50x = 40x + 4000 =&gt; x = 400   So, distance between P and Q = (x + x + 100)km =900 km.   Answer: 900 km
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Two trains start from P and Q respectively and travel towards each other at a speed of 50 km/hr and 40 km/hr respectively. By the time they meet, the first train has traveled 100 km more than the second. The distance between P and Q is?