A tachometer set up at station P recorded the following observations on instrument station A and B:
At staff A Staff readings: 2.225, 2.605, 2.985, and vertical angle = 7o 30’
At staff B Staff readings: 1.640, 1.920, 2.200, and vertical angle = - 5o 30’
The horizontal distance (in meters) between two instrument stations A and B, if the horizontal angle APB is 68o 30’ is ________
(Additive instant and multiplying tachometer are 0 and 100 respectively). ( Assume staff is held vertical)Enter numerical value using the virtual keypad. Round off where necessary.