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I would really appreciate it if someone could please explain to me part c of this M1 level vector question as I am really stuck.

Two trains A and B leave the same station, O, at 10 a.m. and travel along straight horizontal tracks. A travels with constant speed 80 Km/h due east and B travels with constant speed 52 km/h in the direction (5i + 12j) where i and j are unit vectors due east and due north respectively.

(a) Show that the velocity of B is (20i + 48j) km/h.

I got this part ok.

(b) Find the displacement vector of B from A at 10:15 a.m.

I got this as (15i+ 12j).

Given that the trains are 23 km apart t minutes after 10 a.m.

(c) find the value of t correct the nearest whole number.

Thank you.

Cathy

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# Homework Help: M1 Vectors help

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