Question

On its voyage in July 1952, the liner United States won the coveted Blue Ribbon for the fastest crossing of the Atlantic from New York to Cornwall, U.K. The trip took 3 days 10 hours 40 min at an average speed of 34.5 knots (65.5 km/h). This was 10 h 2 min less than the 14-year-old record held by the Queen Mary. What was the average speed of the Queen Mary?

Answer 1

Answer 2

At the end the 10 hr and 2 mins that was subtracted, it actually should be added since the Blue Ribbon was faster than Queen Mary by 10 hr and 2 mins. So in order to find Queen Mary avg speed you need to add that time to the hours that were previously found for the Blue Ribbon. You should get a total of 58.4 km/hr