Ah, I didn't see that the original measure was given as 35 km/s and assumed the MPH figure was the original.By the way, if you are going to do a calculation in metric units, and they *hand* you a metric measurement (km/sec), it doesn't make a whole lot of sense to use the Imperial measure, and then convert it to metric. 35 km/s = 35,000 m/s, and off you go!