Sound - 2

Time taken for the fruit to reach the ground is given by $t=\displaystyle\sqrt { \frac { 2s }{ g } }$

s = distance traveled

g = acceleration due to gravity

t = time taken

From which we get $t=\displaystyle\sqrt { \frac { 2\times 19.6 }{ 9.8 } } =\quad 2seconds$

Now, we get the time taken for sound to reach the monkey is 2.057 - 2 = 0.057 which is 0.057

Now, apply these values in the formula, Speed = distance/ time

Which is Speed = $\displaystyle\frac{19.8}{0.057}$ = 343.859 = 344(approx.)

Also see a similar question by me here and don't forget to up vote my solution and like my problem. . .