The questions are based n the equation:
Glide Range = Height x L/D ratio
Rearranging this gives
Height = Glide Range / L/D ratio.
The diagram shows that
L/D ratio at 10 degrees angle of attack = approximately 11.2
L/D ratio at 8 degress angle of attack = approximately 12.2
If we assume that the 1 mile and 3 mile in the question are nautical miles and assuming 1 nm = 1680 feet we get
For 10 degrees height = 6080 / 11.2 = 542 ft
For 8 degrees height = 6080 x 3 / 12.2 = 1495 feet
These answers are not very close to the options given
But if we assume that the 1 mile and 3 mile in the question are statute miles (5280 feet) we get
For 10 degrees height = 5280 / 11.2 = 471 ft
For 8 degrees height = 5280 x 3 / 12.2 = 1298 feet
These are closer to the options of 480 feet and 1320 feet.
These are very unusual questions and are clearly not from the JAR ATPL system. Where did they come from?