Question of the day

QUESTION OF THE DAY - 22/09/2016

Two trains start from P and Q respectively and travel towards each other at a speed of 50 kmph and 40 kmph respectively. By the time they meet, the first train has travelled 100 km more than the second. Then the distance between P and Q is ____

1. 500 km
2. 630 km
3. 660 km
4. 900 km
5. 850 km