Help with velocity question?

When Lance Armstrong blazed up Mount Ventoux in the 2002 Tour, he was equipped with a 150-millimeter-diameter chainring and a 90-millimeter-diameter sprocket. The sprocket and rear wheel rotate at the same rate, and the diameter of the rear wheel is 700 millimeters. Lance is known for maintaining a very high cadence, or pedal rate. If he was pedaling at a rate of 91 revolutions per minute, find his speed in kilometers per hour. (1 km = 1,000,000 mm) (Round your answer to one decimal place.)