Each of the questions given below consists of three statements, numbered I, II and II respectively. Please read the question and the statements carefully and decide which of the statement(s) is/are necessary to answer the question.

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1.

What is the length of the train $X$ ?

**I.** Train $X$ crosses a telegraph post in $20$ seconds.

**II.** Train $X$ crosses a platform of length $800$ m in $100$ seconds.

**III.** Train $X$ passess through a tunnel $400$ m long in $60$ seconds.

A) I and either II or III only

B) II and III only

C) II and either I or III only

D) III and either I or II only

E) Any two of the three

2.

What is the speed of the train ?

**I.** The train crosses $300$ metres long platform in $21$ seconds.

**II.** The train crosses another stationary train of equal length in $19\frac{1}{2}$ seconds.

**III.** The train crosses a signal pole in $9\frac{3}{4}$ seconds.

A) I and II only

B) I and either II or III only

C) II and either I or II only

D) III and either I or II only

E) None of these

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