• 83.5 km/hr

  • 86.5 km/hr

  • 84.5 km/hr

  • 87.5 km/hr


Let the speeds of two trains be 7X and 8X km/hr. 8x = 400/4 => x= 12.5 km/hrX=4004=>X=12.5Km/hr So speed of first train is 12.5*7 = 87.5 km/hr

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