A train travels 210 km at a uniform speed. If the speed had been
5 km/h more, it would have taken 1 hour less for the same
journey. Find the speed of the train.
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Step-by-step explanation:
210÷x - 210÷x+5=1
210(x+5)-210(x)÷ x^2+5x=1
1050=x^2+5x
x^2+5x-1050=0
x=35
speed of the train is 35 km per hour
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