The time to fall would be sqrt(2H/g)= 5.3 s (using g = 32 ft/s62) . The time for sound to get be heard is 450 ft/(speed of sound) = 0.4 s
I get a total time to hear the sound to be 5.7 s.
I am not sure if they would consider that good agreement (with 5.6 s) or not. Your call.
total time for a rock drop from top of the well to the bottom and the sound bouve back is 5.6 sec, the well dept is 450 ft, true or false
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