Two friends A and B are running on a circular track of perimeter equal to 40 m. At time `t = 0` they are at same location running in the same direction. A is running slowly at a uniform speed of `4.5 km//hr` whereas B is running swiftly at a speed of `18 km//hr`.
(a) At what time `t_(0)` the two friends will meet again?
(b) What is average velocity of A and B for the interval `t = 0` to `t = t_(0)`?

Answer

(a) `t_(0) = (32)/(3)s`; (b) `lt V_(A) gt = lt V_(B) gt = (15sqrt(3))/(8pi) m//s`