The river Ganges discharges 405000 cubic feet of water in a second : how much in an hour ? ... 13. If a railroad car goes at the rate of 65 miles an hour, how long would it take to pass round the globe, the distance being about 25000 miles 1 Ans. 384^- hours ... The national debt of England is about 1990000000 dollars : how many ygars would it take to pay this debt, if 10000000 dollars are paid annually?