The speeds of trains A ( S a S_a S a ) and B ( S b S_b S b ) in km/hr, with S a > S b S_a > S_b S a > S b , are the roots of the equa...

Banking SBI PO Mains Medium Verbal Reasoning MCQ

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The speeds of trains A ( $S_a$ ) and B ( $S_b$ ) in km/hr, with $S_a > S_b$ , are the roots of the equation:

x^2 - 130x + 4200 = 0

Let $T_a$ and $T_b$ be the usual times (in hours) taken by trains A and B respectively to cover a distance $D$ km. If their speeds are interchanged for the same distance $D$ (i.e., train A travels at speed $S_b$ and train B at speed $S_a$ ), then train A takes $(T_a + 2)$ hours and train B takes $(T_b - 2)$ hours.

Find the sum of the original times $T_a + T_b$ .

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The speeds of trains A ( S a S_a S a ​ ) and B ( S b S_b S b ​ ) in km/hr, with S a &gt; S b S_a &gt; S_b S a ​ &gt; S b ​ , are the roots of the equa...

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The speeds of trains A ( S a S_a S a ) and B ( S b S_b S b ) in km/hr, with S a > S b S_a > S_b S a > S b , are the roots of the equa...