Answer:
i think its the 3rd option
Answer: (c)
Step-by-step explanation:
In the given figure, two triangles are similar namely
and 
For similar triangles, the ratio of the corresponding sides are equal.
For option (a), Hypotenuse to Perpendicular ratio is given, that is correct
Similarly for option (b), Perpendicular to hypotenuse ratio is given
Both option (a) and (b) gives the same value of
that is,

Option (c) does not give the correct value of 
8:40 is the next time all three bells will ring together
1350 square feet. 45 *10 = 450 and you convert yards to feet using the ratio of 1:3; 1 yard per 3 feet