The linear velocity will be the tangent velocity of the points in the extreme of the wheel.
Tangent velocity = angular velocity * radius
angular velocity = 2π * frequency
=> angular velocity 2*3.14*600 rad/min = 3,768 rad/min
tangent velocity = 70 in * 3768 / min = 263,760 in/min
Convert to m/s =>
263,760 in/min * 2.54 cm / in * 1m / 100cm * 1min/60s = 111.7 m/s
Answer: velocity = 111.7 m/s
