Let's analyze each statement:
Statement I: The train crosses a 100-meter platform in 𝑌 Y seconds but doesn't provide the time to cross a signal post or the train's speed.
Statement II: The train's speed is 80 km/h but no time is given for crossing a signal post or platform.
Even together, these statements don't provide enough information to calculate the train's length.
So, the correct option is (D): Both statements together are not sufficient to answer the question.