Two cyclists start on a circular track from a given point but in opposite directions with speeds of 5 m/sec and 7 m/sec respectively. If the circumference of the circle is 360 metres, after what time will they meet at the starting point for the first time?
A)180 sec B)720 sec C)540 sec D)360 sec

• ans will be 20sec
  since both of them are moving in opposite directions then their speeds will add i.e. 5+7 = 12
  distance between them = 360
  therefore 360/12 = 20sec
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• option c is correct..can i know the answer
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• Ans 360
  LCM of (360/5,360/7)
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