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# The ratio between the speeds of two trains is 7: 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is ?

83.5 km/hr

84.5 km/hr

86.5 km/hr

87.5 km/hr

$8X=\frac{400}{4}$
$⇒X=12.5Km/hr$