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Two people start at the same place and walk around a circular

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Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 1.7X10 ^-3 rad/sec and the other has an angular speed of 3.4X10^-3 rad/sec . How long will it be before they meet. (the answer is 1200 seconds I do not know how that is obtained)

The easiest way to do it is to go to the relative reference frame. the anular velocity of one person with respect to another is (1.7+3.4)*10^(-3) =5.1*10^(-3) rad./sec now one full revolution is 2PI rad, hence the people will meet in 2PI/5.1*10^(-3) =1232 sec

David :

hope this helps

David :

Answer: 1232 sec or rounding you get 1200 sec

David :

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