[QUOTE]
John is at town A , moving towards town B at 100M/Min
Mark is at town B , moving towards town A at 80M/min
Dick is at town B , moving towards town A at 75M/Min[
When John and Dick meet while moving toward town A and B , Mark is 6M ahead of them.
John & Dick
------------------------------------V----^---------------
Mark [6M ahead of them]
What is the distance between both towns.
[/QUOTE]
In every hour, the distance between Dick and Mark is increased by 80M-75M=5M
In order to create a 6M difference in distance, they have traveled 6 / 5= 1.2hours. This is also the time taken for John and Dick to meet.
Therefore distance between A and B = 100 x 1.2 + 75 x 1.2 = 210M
Note: its speed is in mins...
change all the hours to minutes.