Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and--
A train crosses another train running in the opposite direction in x seconds. What is the speed of the train ?
I. Both the trains have the same length and are running at the same speed.
II. One train crosses a pole in 5 seconds.
I : Let the length of each train be h and speed of each train be s
$$\frac{h + h}{s + s}$$ = x
=> $$\frac{h}{s}$$ = x
We cannot find, h and s individually.
Thus, I alone is not sufficient.
Similarly in II : $$\frac{h}{s}$$ = 5
Thus, II alone is not sufficient.
I & II : Combining the two equations
$$\frac{h}{s}$$ = x = 5
Thus , there are 2 variables and 1 equation.
Thus, I & II together are not sufficient.
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