Two guns were fired from same place at a...

Two guns were fired from same place at an interval of 28 mins. But a man sitting in the train going away from the place hears the 2nd firing 30 min after the 1st. If the speed of train is 20 km/hr find the speed of sound ?

350 km/hr

300 km/hr

450 km/hr

325 km/hr

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