Question

Two guns were fired from the same place at an interval of 20 minutes but a person in a train approaching the place hears the sound 16 minutes 30 seconds after the first. Find the speed of the train (in kmph) supposing that the sound travels 330 meters per second.

A 240 km/hr
B 120 km/hr
C 242 km/hr
D 252 km/hr
E None of these
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