Question

Vinay fires two bullets from the same place at an interval of 12 min. 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 m/s)?

1)660/23 m/sec
2)220/7 m/sec
3)320/23 m/sec
4)110/23 m/ sec​

Answer 1

Answer:

option 3

320/23

Step-by-step explanation:

that is

sound speed is 330

it has travelled 30seconds to reach Raju sitting in train

so the distance covered by by the sound is equal to the distance covered by the train

so the

distance covered by the train is equal to 11.30 (690sec) * x (x is the speed of the train we need to find)

by equating

690x = 30*330

x = 330/23

Answer 2

The approximate speed of train travels at the speed $\frac{330}{23} \frac{m}{s}$ or $14.35$.

Step-by-step explanation:

Distance travelled by the train in $11$ minutes $30$ seconds,

distance $690*690*$ is covered by sound in $30 seonds$

$=690x$

$=30*330690x$

$\\ x=14.35$

$x=14.35\frac{m}{s}$ or

$\frac{330}{23} \frac{m}{s}$.