Circumference of the circle = 2 × (22/7) × 350 = 2200 m
Now, as they run in the opposite direction, they take 3 min and 20 sec to meet i.e. 200 sec.
Let their speeds be v1 and v2
So, 2200/(v1+ v2) = 200 Or v1+ v2 = 11
Also, when they run in the opposite direction, they meet at 3 distinct points.
So, the difference between the simplest ratio of v1 and v2 must be equal to 3.
So, we can say v1 = 7 and v2 = 4
So, the slower runner has a speed of 4 m/s
Time taken by her to complete one round = 2200/4 = 550 sec = 9 minutes 10 seconds.