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A car is moving with a speed of 72 kmph towards a hill. Car blows horn at a distance of 1800 m from the hill. If echo is heard after 10 seconds, the speed of sound (in m/sec.) is

\[\begin {array} {1 1} (1)\;300 & \quad (2)\;320 \\ (3)\;340 & \quad (4)\;360 \end {array}\]
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(3) 340
answered Nov 7, 2013 by pady_1

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