if the R.L. of a SM. is 100.00 m, the back-sight is 1.215 m and the foresight is 1.870 m, the R.L. of the forward station is:

On a plan that was scaled at 1 cm=40 metres, a surveyor measured the distance between two spots, and the result was 450 metres. But afterwards he realised he had been using a scale of 1 cm=20 m. then actual distance between the spots is:

On a plan that was scaled at 1 cm=40 metres, a surveyor measured the distance between two spots, and the result was 450 metres. But afterwards he realised he had been using a scale of 1 cm=20 m. then actual distance between the spots is: