1. ## why am i getting this answer

Q1. The rear wheels of a car are 650mm in diameter. If the wheels make 5505 turns in 3 minutes, find: the average speed in meters per second of a point on the circumference of one of the tyres.
This how I did it: Radius=650mm divided by 2=325mm.
325mm divided by 1000=0.325m.
2x3.14x0.325m=2.041m.
5505x2.041=11235.705m.
3min x 60sec, =180seconds.
11235 divided by 180=62.41m/s
So I get 62.41m/s but the answer says 6.24m/s where am I going wrong.
(i know i should have done better at school)

2. Originally Posted by prs
Q1. The rear wheels of a car are 650mm in diameter. If the wheels make 5505 turns in 3 minutes, find: the average speed in meters per second of a point on the circumference of one of the tyres.
This how I did it: Radius=650mm divided by 2=325mm.
325mm divided by 1000=0.325m.
2x3.14x0.325m=2.041m.
5505x2.041=11235.705m.
3min x 60sec, =180seconds.
11235 divided by 180=62.41m/s
So I get 62.41m/s but the answer says 6.24m/s where am I going wrong.
(i know i should have done better at school)