Aboy standing in front of a high steep rock claps after 2.5 second if the velocity of sound is 340m/s find the distance of the boy from the rock

The time taken for the sound to travel to the rock and back is $t = 2.5\text{ s}$.
The velocity of sound is $v = 340\ \frac{\text{m}}{\text{s}}$.

The sound travels from the boy to the rock and then reflects back to the boy. So, the total distance covered by the sound is twice the distance of the boy from the rock.
Total distance = Velocity $\times$ Time

The total distance calculated in Step 2 is for the sound to travel to the rock and back. To find the distance of the boy from the rock, divide the total distance by 2.
Distance to rock = $\frac{\text{Total distance}}{2}$

The distance of the boy from the rock is: