D. An undisclosed disease that he had harbored for years. DR. Lanyon had died as a result of falling ill
If Nora bikes 30 miles per 1 hour, she'll ride 5 times as much in 5 hours.
30*5=150 miles
Jiro at 45 miles per 1 hour
45*5=225 miles in 5 hours
To find out how many more miles Jiro rides than Nora, subtract:
225-150=75
:)
