Answer:

Step-by-step explanation:
given,
constant altitude of aircraft (y)= 1000 ft
steady speed of aircraft = 232 ft/sec
distance between aircraft and trawler(z) = 1600 ft
using Pythagoras theorem
z² = x² + y²

x = 1249 m


differentiating both side w.r.t to t





so the speed at which trawler is receding is 181.11 ft/s