A falcon and its trainer are exactly midway between two vertical & parallel hills. As the trainer fires the gun, the falcon starts flying directly towards one of the hills. The falcon hears first and second echoes of the gun-shot at 2 s and 3 s respectively Ignore reflection of sound from the falcon and from the trainer. The air is practically still. Among the following options, respective speeds of the falcon and the sound (in m/s) could be _________ .
(a) 85 & 340
(b) 68 & 340
(c) 50 & 350
(d) 40 & 360
