Double-track

On double-track express met with a freight train. Express travel at speed 72 km/h, a freight train at speed 36 km/h. After what time period will be from 9 km apart?

Result

t =  5 min

Solution:

t=9/(72+36) 60=5 mint=9/(72+36) \cdot \ 60=5 \ \text{min}



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