Question

A ship sail from town A(0°,20°W) to town B(10°N,20°W) at 16 knots. If it leaves town A at 8am on Tuesday, when will it reach town B?

Answer 1

I need help

Answer 2

Luckily went straight north so on a meridian (which is a great circle) where one minute of arc is one nautical mile.
10 degrees * 60 minutes/degree = 600 nautical miles
600 miles at 1 hour / 16 miles = 37 1/2 hours
that is one 24 hour day + 13.5 hours
8 am Wednesday + 13.5hours
so 8 pm wed + 1.5 hours
9:30 Wed evening

Answer 3

... and that is the first time in my life that I have seen a math question about navigation worded correctly !