| Directions: Each of the questions below consists of a question and three statements I, II and III given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. [IBPS (PO) 2012] |
| What is the speed of train? |
| I. The train crosses a signal post in 20 s. |
| II. The train crosses a 260 m long platform in 33 s. |
| III. The train crosses another stationary train of same length in 40 s |
A) I and III
B) II and either I or III
C) All I, II and III
D) Any two of the three
E) Even with all three statements answer cannot be given
Correct Answer: B
Solution :
| Let the length of train be x m and Its speed be |
| y m/s. |
| I. \[\frac{x}{y}=20\] (i) |
| II. \[\frac{x+260}{y}=33\] (ii) |
| III. \[\frac{2x}{y}=40\] (iii) |
| Clearly, II and either I or III are necessary to answer the question. |
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