A train left the North Pole and traveled west at 70kmhr Two

A train left the North Pole and traveled west at 70km/hr. Two hours later, another train left the North Pole and traveled east at 90km/hr. How many hours had the first train traveled when the were 1420 km apart?

Solution

Someone else pointed out that you can\'t go west from the North Pole. All directions are South.
This is true at the true North Pole but are we talking true North Pole or magnetic North Pole?
There aren\'t any trains at the North Pole either.
The North Pole is in the Arctic Ocean. The South Pole has land; the North Pole doesn\'t

t =hours traveled by second train at 90 kmph train
t+2=hours traveled by first train at 70kmph
70(t+2)+90t=1420