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Two persons A and B travelling at 60 km/...

Two persons A and B travelling at `60 km//hr^(–1)` in their cars moving in opposite directions on a straight road observe an airplane. To the person A, the airplane appears to be moving perpendicular to the road while to the observe B the plane appears to cross the road making an angle of `45°`.
(a) At what angle does the plane actually cross the road (relative to the ground).
(b) Find the speed of the plane relative to the ground.

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