Two trains A and B start simultaneously in the opposite direction from two points P and Q and arrive at their destinations 16 and 9 hours respectively after their meeting each other. At what speed does the second train B travel if the first train travels at 120 km/h

Q: Two trains A and B start simultaneously in the opposite direction from two points P and Q and arrive at their destinations 16 and 9 hours respectively after their meeting each other. At what speed does the second train B travel if the first train tr…

s 1 s 2 = t 2 t 1 ⇒ 120 s 2 = 9 16 = 3 4 ⇒ s 2 = 160 k m / h

90 km/h
160 km/h
67.5 km/h
None of these

Correct Answer: 160 km/h

Explanation:

$\frac{s}{1} = \frac{t}{2}$

$\Rightarrow \frac{120}{s} = \frac{9}{16} = \frac{3}{4}$

$\Rightarrow$ $s 2 = 160 k m / h$

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