Question

two cars A and B initially 120 km apart start moving towards each other on the same track with the velocity of 60 km per hour each at the moment of start a blow a blows official which reflects on B and subsequently reflects from a and so on take the velocity of sound waves in the air as 1200 km per hour the distance travelled by the sound waves before the train crashes will be​

Answer 1

Answer:

120 km atq in the question