Vinay fires two bullets from the same place at an interval of 12 minutes but Raju sitting in a train...........

Quantitative Aptitude ( CCS) Time & distance

Vinay fires two bullets from the same place at an interval of 12 minutes but Raju sitting in a train approaching the place hears the second report 11 minutes 30 seconds after the first. What is the approximate speed of train (if sound travels at the speed of 330 meter per second?

660/23 m/s

220/7 m/s

330/23 m/s

110/23 m/s

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Explanation:

Distance travelled by the train in 11 minutes 30 seconds(690 seconds)
=690x=690x metre where xx is the speed of the train in meter/second.
If the train had not travelled this distance, Raju would have heard the second shot only after 12 seconds, instead of 11 minute 30 seconds.
Therefore, the distance 690x690x is covered by sound in 30 seconds.
= 690x = 30×330690x = 30×330
= x=14.35x =14.35 m/s or 330/23 m/s

Hence, option 3 is the correct answer.