What is the flag tree?

Q. A tree 6m tall casts a 4m long shadow. At the same time, a flag pole casts a shadow 50m long. How long is the flag pole?

Q. What is the British flag called?

Q. Mark (✓) against the correct answer
A tree, 6 m tall, casts a 4-m-long shadow. At the same a flag pole casts a 50-m-long shadow. How long is the flag pole?

(a) 50 m
(b) 75 m
(c) $33\frac{1}{3}\mathrm{m}$
(d) none of these

Q. What is this flag named as?

Q.
What does this flag represent?