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

### Customer Question

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)
Submitted: 5 years ago.
Category: Homework
Expert:  David replied 5 years ago.

David :

hello

David :

thanks for requesting my help

David :

I'll post the solution in 1-2 mins

David :

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)
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 :

please do not hesitate to request me in the future, I'll be glad to assist.