Answer:
2/10 or 0.2
i dont know which tenths you wanted so i did both
An equilateral triangle.
all sides are the same so the higth of the object will be the same as length of the shadow.
To answer this question I tried to find a common multiple of 21 and 35 which I found to be 105. As they are in minutes 105 is 1 hour and 45 minutes; after this I found 1 hour 45 munutes after 7:30, I then got 9:15
9:15 is my answer