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the train traveled at a speed of 90 mph for 3 hours then slowed down to 72 mph for the next 1 1/2 hours. what is the average speed of the train?

Respuesta :

Speed = total distance / time

Speed = (90x3 + 72 x 1 1/2) / ( 3 +1 1/2)

Speed = ( 270+108 ) / 4 1/2

Speed = 100 mph

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