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The figure below shows the position of a boat Q which is observed sailing directly towards the pier P at the base of a vertical cliff PT. the angle of elevation of the top of the cliff from Q is #25.4^0#. after 14seconds the boat is at point R and the angle for elevation of T is now #64.7^0#.
If the cliff is 50m high, calculate
a)the distance PQ
b)the distance QR
c)the speed of the boat in km/hr
