Question
Train 'C' of length 300 meters passes a pole in 10
seconds. Train 'D', traveling at triple the speed of train 'C', crosses a bridge in 12 seconds from the opposite direction. If the length of the bridge is 400 meters, find the length of train 'D'.Solution
ATQ, Speed of train 'C' = 300/10 = 30 m/s Speed of train 'D' = 3×30 = 90 m/s Relative speed = 30+90 = 120 m/s Total distance covered by train 'D' in 12 seconds = 120×12 = 1440 meters Length of train 'D' = 1440−400 = 1040 meters So, the length of train 'D' is 1040 meters.
If 21 @ 16 = 12 and 30 @ 25 = 12, then 22 @ 17 = ?'. What will come in place of question mark?
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