Write a program to calculate the depth of a well. To measure the depth of the well, you take three readings of the time it takes in seconds for a pebble to hit the water. The program should read three floats from stdin. Calculate the depth d given by d=1/2(g*t*) where g=9.81 m/(s^2) for Dublin and t is the average of the three readings. The program should print the depth of the well in metres. For example: Test Input Result Standard example 10 9.8 10.1 The depth of the well = 487.2 m