Please check answer (percale)?

Question

A wheel turns through 200 rpm. How fast does it turn in radians per second?
my answer:
200rpm(2pi)=400pi radians per minute
400pi/60=6.7pi (is that right?)

Answer 1

Given that a wheel turns to 200 rpm.

200 rpm means 200 revolutions per min.

1 min = 60 sec

1 revolution = 2pi

200 rpm = 200*2*pi rads/min

(1/60)*200*2*pi rads/sec          

(40/6)*pi rads/sec   (Value of pi = 22/7 =3.14)

= 20.94 rad/sec

so, yes you're right.