Question
Two trains X and Y start at the same time in the
opposite direction from two points P and Q and arrive at their destinations 100 and 81 hours respectively after their meeting each other. At what speed does the second train Y travel if the first train travels at 108 km/h.Solution
Let the speed and time of two trains be s1 and s2, and t1 and t2. s1/s2 = (t2/t1)1/2 => 108/s2 = 9/10 => s2 = 120 km/hr.
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