An engine (train) of length 1000 m is moving at 10 m/s. A bird starts at the…

An engine (train) of length 1000 m is moving at 10 m/s. A bird starts at the engine, flies to the far end of the engine at 'x' m/s, and then flies back to the engine at '2x' m/s. If the bird's total travel time is 187.5 s, find x and 2x in km/hr.