The blood flow through the skeletal muscle increases by 3 times during exercise compared to rest.
During exercise, the demand for oxygen and nutrients in skeletal muscles increases significantly. To meet this increased demand, blood flow to the muscles also increases dramatically.
Taking a reference to the image, the blood flow through the skeletal muscle increases from 2000 cm³/minute at rest to 8000 cm³/minute during exercise. This means that the blood flow increases by 4 times during exercise compared to rest.
Increase in blood flow = (Blood flow during exercise - Blood flow at rest) / Blood flow at rest
= (8000 cm³/minute - 2000 cm³/minute) / 2000 cm³/minute
= 6000 cm³/minute / 2000 cm³/minute
= 3 times