for her average speed in km/h.
11 A train travels from Newcastle to Edinburgh at an average speed of 68 mph, correct
to the nearest whole number. The journey is 80 miles, to the nearest 10 miles.
Bryn says that the journey will definitely take less than an hour and a quarter.
a Show working to explain why Bryn is wrong.
b Calculate the shortest possible time it could take to complete the journey to the
nearest minute.