Austin takes 1 minute and 45 seconds to run three-quarters of a circular track. his rate of motion is π/ radians per second.

To answer the question above, 
2pi x (3/4) = 3 pi /2
as we know that
1: 45 min --> 105 seconds

so the

rate = d/t = 3pi / 2 / 105 s =
So the answer would be
π/70 rad/s
I hope I helped you with my answer above, Have a nice day!

The first option would be correct if it were one half and not one